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QSAR


Index

A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z




Index

A

Active Conformation control panel
accessing, 186
active conformer
displaying, 187
overriding default value, 187
selecting, 186-187
activities
observed vs. predicted, 13
activity
biological, 12, 15
observed vs. predicted, 20
predicted, 255
predicting, 13, 24
Activity column, 15
activity data
entering, 15
activity flow in QSAR+, 11
activity plot, 255
Add All icon, 98
Add Default icon, 99
ADF, 8
ADF menu card, 8
adjacency matrix, 78
algorithms
genetic, 234
genetic function approximation (GFA), 234
MARS, 234
Align Models control panel, 192
Align Molecules menu card, 6
Align Preferences control panel, 192
aligning models, 191
alignment information
deleting, 193
Alignment module, 3
AlogP98 descriptor, 86, 142
A-Matrix, 75, 78
Analog Builder, 111
analysis
genetic, 233
Analysis menu card, 8
analysis of variance table, 217-218
ANOVA table, see analysis of variance table
Apol descriptor, 51
descriptors
Apol, 51
area descriptor, 83
ASCII format, export, 109
atom matching, 190
atoms
core, 191
automated processing in QSAR+, 112, 113

B

beta coefficient table, 218-219
biological activity, 15, 207
training set molecules, 12
biological processes, underlying, 11, 275
Boltzmann Jump, 184
bootstrap r2, 21
BS r2 (Bootstrap r2), 219
Build QSAR menu card
Build Molecules, 276
Builder, Analog, 111
building a QSAR equation, 275-??

C

(Molecular Connectivity Index), 60, 61
candidate compounds, 275
card decks, 4
Builders 1, 7
Combi-Chem, 7
Conformations, 7
Databases, 8
Drug Discovery, 6
Hypothesis Models, 8
OFF Methods, 8
OFF Setup, 8
QSAR, 6, 13
Quantum I and II, 8
Tables & Graphs, 9
CASTEP, 8
CASTEP Interface menu card, 8
Catalyst ConFirm interface, 3
Catalyst environment, 4
Catalyst HipHop interface, 3
Catalyst menu card, 8
CatShape menu card, 8
cell management, 103
Cerius2
starting, 4
Cerius2 Conformer Search module, 183
Cerius2 modeling environment, 2
Cerius2 session, 107, 257
Cerius2 Visualizer, 2
charge calculation preferences, 114
Charge descriptor, 51
Charges control panel, 114
Charges menu card, 8
charges, calculation of, 15, 112
charging molecules, 114
chemical structure
data for, 14
importing, 112
chiral centers, 85, 136
Clear icon, 98
Clear XY icon, 100, 200
ClogP, 138
cluster analysis, 12, 33
hierarchical, 35
Jarvis-Patrick, 34
relocation, 35
CMR, 138
column, 96
Combi-Chem card decks, 7
complementary information content, 77
compounds, candidate, 275
confidence level, 225
Configure GFA control panel, 209, 241, 248
Confirm Interface menu card, 8
conformation, 127, 182
conformation generation preferences, 116
selecting a generation method, 183
setting, 183-184
conformation search method
applying automatically, 184
selecting, 184
conformational descriptors, 50
conformations
generating, 12
Conformations card deck, 7
Conformer Analysis menu card, 7, 8
Conformer Search menu card, 7, 8
conformers
applying an energy cutoff, 184
current, 127, 128, 130
displaying an active, 187
displaying information about, 127
generating, 179, 185
generation preferences, 116
lowest energy, 185
minimizing, 184
selecting, 194-195
selecting an active, 186
specifying number, 185
table of, 128
Conformers table, 128, 190, 194
regenerating, 195
sample, 129
uses of, 128
connected graph, 78
contingent descriptors, 131
control panels
Active Conformation, 186
Charges, 114
Configure GFA, 209, 241, 248
Equation Viewer, 237
Export a Table, 109
Generate Analogs, 111
Load Model, 112
QEq Preferences, 114
QSAR Conformation Generation, 117, 183
QSAR Preferences, 187, 189
Save Descriptor Database, 156
Save Session, 106
Select Conformers, 194
Shape Reference, 188, 189, 190
Sketcher, 111
Study Table, 94
Copy icon, 98
core atoms, 191
core model, 191
core substructure search, 190
Corr icon, 229
correlation coefficient, 44
correlation matrix, 44
displaying, 228
Correlation Matrix icon, 103
correlation of two vectors, 44
COSV descriptor, 79
count, 230
crossover, 234
cross-validated r2, 21
cross-validation, 41
CSS, 191
CSS search, 190
current conformer, 127, 128, 130
current equation population, 239
Cut icon, 98
cutoff, energy, 117
CV r2 (Cross-validated r2), 219
cycle, 78

D

Database Query, 3
Databases card deck, 8
Daylight Descriptors control panel, 138
Daylight fingerprint, 99
Daylight fingerprints, 144
default descriptors
QSAR, 17, 18
Default Descriptors Set
adding to Study Table, 137
default processing of molecules, 17
default settings
ANOVA table, 216
beta coefficient table, 216
conformers for 3D QSARs, 194
descriptors, 17, 133
GFA, 236
QSAR validation, 224
QSAR+, 112
shape reference compound, 188
stepwise multiple linear regression, 215
using, 112
variables, 197, 200, 202
defaults descriptor set, QSAR, 135
defaults set, 95
definitions, 78
degrees of freedom, 43
Delete icon, 98
deleting equations, 254
dendrogram, 36, 37
density descriptor, 84
Dep SD, 218
dependent variable
setting, 18
dependent variables, 197
descriptive statistics table, displaying, 229
descriptor, 17
selecting/unselecting, 137
descriptor database
editing, 148
opening, 149
saving, 155
descriptor database table, 148
columns, 150
Command column, 151
Decimal Places column, 151
Default column, 151
Description column, 151
Family column, 150
Format column, 151
name column, 150
Panel column, 151
Token column, 151
Units column, 151
Value column, 150
3D column, 151
descriptor preferences, 138
descriptor relationships, 228
descriptors, 11, 17, 133, 275
adding to Study Table, 143
AlogP, 86
AlogP98, 86
Apol, 51
Area, 80, 83
calculating, 12, 17
calculation of, 17
Charge, 51
classes of, 133
conformational, 50
conformationally dependent, 127
contingent, 131
COSV, 79
creating, 152
default, 17, 133
Density, 80
density, 84
Dipole, 51
dipole, 51
DIPOL_MOPAC, 56
electronic, 50, 181
Energy, 50
EPenalty, 50
equation, 148
equation coefficient, 148
F, 49
families, 150
Fcharge, 51
Fh2o, 87
Fo, 79
Foct, 87
generating non-shape, 181, 194
generating shape, 180, 194
graph-theoretic, 56
HA, 49
HB, 49
Hf, 89
Hf_MOPAC, 56
HOMO, 51
HOMO_MOPAC, 56
identifying defaults, 151
information content, 56
InterEleEnergy, 55
InterEnergy, 55
InterVDWEnergy, 55
IntraEnergy, 54
Jurs, 80, 82
LowEne, 50
LUMO, 51
LUMO_MOPAC, 56
MinIntraEnergy, 55
modifying, 154
MolRef, 86
MOPAC, 56
MR, 49
names, 150
NCOSV, 79
overriding default, 17
pi, 49
principal moment of inertia, 84
QSAR defaults set, 135
quantum mechanical, 55
R, 49
radius of gyration, 84
RadOfGyration, 80
recalculating conformer-dependent, 195
receptor, 54
Rotbonds, 85
S, 51
selecting, 137
selecting non-shape 3D, 194
Shadow indices, 80
shadow indices, 80
shape, 79
ShapeRMS, 79, 80
Sm, 48
Sp, 48
spatial, 80-??, 181
SRVol, 79, 80
statistical measures, 228
Sterimol-B1-B4, 50
Sterimol-B5, 50
Sterimol-L, 49
StrainEnergy, 55
surface area, 82
terms, 78
thermodynamic, 85, 86, 181
topological, 56, 57
viewing, 12
Vm, 80, 85
Descriptors control panel, 137
Descriptors Database, 137
Descriptors pulldown
Study Table, 99
DF (degrees of freedom), 217
DIF format, export, 109
DIFFV descriptor
descriptors
DIFFV, 79
Dipole descriptor, 51
dipole descriptor, 51
DIPOL_MOPAC descriptor, 56
distance matrix, 78
Diversity module, 3
D-matrix, 76, 78
Drug Discovery card deck, 6
card decks
Drug Discovery, 5
Dynamics Simulation menu card, 8

E

edge adjacency matrices, 76, 78
Edit pulldown
Study Table, 97
edit window, 95
Study Table, 95
ED-matrix, 76, 78
electronic descriptors, 50
E-matrix, 76, 78
Empty Cells icon, 103
energy cutoff, 117
Energy descriptor, 50
energy minimization preferences, 115
EPenalty descriptor, 50
equation set, 253, 256
Equation Viewer, 21, 219-221, 237, 251
automatic display of, 252
default display of, 252
deleting equations, 254
displaying, 252
plotting equations with, 255
renaming equation sets, 256
selecting equations with, 253
use in GFA, 240
uses of, 251
working with, 251-??
Equation Viewer menu card
View Equations, 252
equations
evaluating QSARs, 42
evolving a population of, 237
initial population, 234
mutation, 243
randomizing, 240
term types, 241
ESOCS, 8
ESOCS menu card, 8
Euler formula, 73
evolution, continuing, 239
evolving an equation population, 237
evolving models, 40
experiment, 112
Export a Table control panel, 109
export formats, Study Table, 109
exporting a Study Table, 109
external validation, 46

F

F descriptor, 49
F statistic, 43
F Value, 215
FastStructure menu card, 8
Fcharge descriptor, 51
Fh2o descriptor, 87
Field Analysis (MFA) menu card, 6
File pulldown
Study Table, 96
Find Outliers icon, 103
fitness
best score, 234
function, 234
float format, 155
Fo descriptor, 79
Foct descriptor, 87
Force Field Editor menu card, 8
formats, Study Table export, 109
formula capabilities, 94
fragment constants descriptors
descriptors
fragment constants, 48
F-test, 217
function, fitness, 234

G

Gaussian, 8
Gaussian menu card, 8
Generate Analogs control panel, 111
generating a QSAR equation, 11
generating conformers, 114
generation, 40
genetic algorithms, 234
genetic analysis, 233
genetic partial least sqaures, 235
preferences for, 244
see also genetic function approximation
Genetic Analysis (GFA) menu card, 6
genetic Function Approximation, 40
genetic function approximation, 208-209, ??-210
advantages of, 234
continuing the evolution, 239
default processing in, 236
Equation Viewer in, 237
five steps in, 236
mutation probabilities in, 243
overview of, 234
performing an analysis, 236
population size, 245
preferences for, 244
randomizing the current population, 240
selecting, 209, 247
smoothing parameter, 245
specifying parameters, 209
starting an analysis, 235
term types available, 241
use of the Equation Viewer in, 237
Genetic Function Approximation module, 2
genetic function approximation See also GFA., 40
genetic partial least squares, 41, 209, 235, 239
selecting, 209
specifying preferences, 235
genetic partial least squares See also G/PLS., 41
genetic partial least squares, specifying parameters, 209
Genetic, see genetic function approximation
geometric descriptors
calculating, 80
GFA method
applying, 20
GFA, see genetic function approximation
GFA, specifying parameters, 209
Ghose, A. K., 86, 272
Graphs menu card, 9
Grid Scan, 184
G/PLS, see genetic partial least squares, 235

H

HA descriptor, 49
HB descriptor, 49
HCA, 35
Hf descriptor, 89
Hf_MOPAC descriptor, 56
hierarchical cluster analysis, 35
Hiphop Interface menu card, 8
histograms
of variables, generating, 19
Histograms icon, 102
HOMO descriptor, 51
descriptors
HOMO, 52
HOMO_MOPAC descriptor, 56
Hosoya Index, 58
Hosoya index
benzene, 59
hydrogen-bond acceptors, definition of, 142
hydrogen-bond donors, definition of, 142
hydrogens, addition of, 15, 112
Hypothesis Models card deck, 8

I

IAC Index, 75
icons
Add All, 98
Add Default, 99
Clear XY, 100, 200
Corr, 229
Correlation Matrix, 103
edit commands, 98
Empty Cells, 103
Find Outliers, 103
Histograms, 102
Props, 154
Rune plots, 102
Set X, 100
Set Y, 100
Stats, 230
Summary Statistics, 103
Validate, 225
Validate QSAR, 103
X Set, 198
Y Set, 198
2D Plot, 102
3D Plot, 102
identifying variables, 201
importing chemical structures, 112
independent variable
setting, 19
independent variables, 197, 218
Index, 221
indicators, variable, 96, 199
information content index, 77
initial population, equation, 234
Insert icon, 98, 152
integer format, 155
Intercept (b0), 218
internal validation, 45
Isis keys, 144

J

Jarvis-Patrick clustering, 34

K

Kier and Hall Molecular Connectivity Index, 60
Kier & Hall Subgraph Count Index, 68
Kier & Hall Valence-Modified Connectivity Index, 67
Kier's Alpha-Modified Shape Indices, 71
Kier's Shape Indices, 70
knot, spline, 242
kurtosis, 230

L

lack of fit, 221, 234, 237
LFE, 86
ligand-receptor binding, 179
linear free energy relationship, ??-272
linear polynomial terms, 241
linear spline terms, 241
Linear, see multiple linear regression
Load Model control panel, 112
loading spread, 40
LOF, see lack of fit
LowEne descriptor, 50
LSE, 221
LUMO descriptor, 51
descriptors
LUMO, 52
LUMO_MOPAC descriptor, 56

M

Main panel, 4
MARS, see multivariate adaptive regression splines
mathematical function library, 94
maximum, 229
maximum common subgraph, 190
MCS, 190, 191
MDL Interface menu card, 8
MDL ISIS keys, 99
mean, 229
mean squares, 43, 217
median, 229
menu cards, 6-??
menubar
Study Table, 94
method, statistical, 94, 235
MFA, see molecular field analysis
minimal path, 78
minimization, energy, 15, 112
Minimizer menu card, 8
minimizing molecules, 114
minimum, 229
MMFF menu card, 7
Model Receptor menu card, 6, 8
Model Receptor module, 3
models, aligning, 191
models, QSAR and QSPR, 233
Molecular Connectivity Index, 60, 61
Molecular Field Analysis, 2
Molecular Flexibility Index, 72
Molecular Shape Analysis module, 3
molecular shape analysis tasks, 178-182
construct a trial QSAR, 181
determine other molecular features, 181
generate conformers, 179
hypothesize an active conformer, 179
measure molecular shape commonality, 180
perform pair-wise molecular shape superpositions, 180
select a candidate shape reference compound, 180
molecular shape analysis, starting, 178-??
molecular superpositions, 180
molecule
modifying, 25
predicting its activity, 24
molecules
loading, 14
Molecules pulldown
Study Table, 98
MOPAC descriptors, 56
MOPAC Interface menu card, 8
MR descriptor, 49
MSA, see molecular shape analysis
MSI format, export, 109
multigraph indices, 77
multiple bonds
as single edges, 57
Multiple linear regression, 38
multiple linear regression, 210-??
selecting, 210
multivariate adaptive regression splines, 234
mutation operation, equation
add a new term, 244
extend an equation, 244
reduce an equation, 244
shift a spline knot, 244

N

NCOSV descriptor, 79
non-shape descriptors, 181

O

observations, 96, 112
limiting the number of, 204
selecting, 203, 204
OFF Methods card deck, 8
OFF Setup card deck, 8
Open Force Field menu card, 8
Open Force Field Methods, see OFF Methods card deck
Open Force Field Setup, see OFF Setup card deck
operations, Study Table, 105
outliers, 21, 219
highlighted in the Study Table, 21
identifying, 224
removing, 228, 242

P

parameter, smoothing, 245
partial charges, 82
partial least squares, 39
partial least squares regression, 95, 210-211, ??-214
selecting, 211
specifying parameters, 211, 212, 213
partial least squares See also PLS., 39
Paste icon, 98
path, 78
path length, 78
PCA, 30, 211
PCR, 213
pi descriptor, 49
pKa descriptors, 147
plot, 221-223
activity, 255
predicted versus observed, 221
residuals, 222
rune, 230
plotting equations, 255
plot, 2D
connected to Study Table, 22
PLS, 40
PLS, see partial least squares regression
PMI descriptor, 80, 84
polar atoms, definition of, 140
population size, equation, 245
predicted activity, 255
predicted versus observed plot, 221
preferences
conformer generation, 117
energy minimization, 116
genetic analysis, 244
Preferences pulldown, Study Table menubar, 104
preferred QSAR model, 238
PRESS, 21
PRESS (Predicted sum of squares), 218
principal components analysis method, 211
Principal components analysis See also PCA., 30
principal components analysis See PCA., 12
principal components regression, 39, 213
principal regression analysis See also PCR., 39
probability distribution, 74
probability, mutation, 243
probe radius, definition of, 140
processes, biological, 11, 275
processing
automated, 112, 113
Props icon, 154

Q

QEq Preferences control panel, 114
QSAR
default descriptors, 17
QSAR analysis
saving study, 13
QSAR card deck, 6, 13
QSAR Conformation Generation control panel, 117
displaying, 183
QSAR data display, 228-??
QSAR equation
analyzing, 21
applying, 13
building, 11-??, 13-??, 275-??
defined, 11, 275
deleting, 254
evaluating, 42
evaluating conformer data, 194
generating, 12, 20, 195
internal consistency, 224
multiple in GFA, 233
opening, 23
optimizing, 181
plotting, 255
predictive power, 223
preferred model in GFA, 238
process of generating, 11
renaming, 256
saving, 13, 23, 256
selecting conformer data, 194
selecting with the Equation Viewer, 253
term types in GFA, 241
validating, 12, 20
QSAR menu card, 6
Descriptor Database, Save As, 156
Select, Variables, 200
QSAR Preferences control panel, 187, 189
QSAR statistical results, 215
see also analysis of variance table, beta coefficient table
QSAR study
saving, 26
QSAR tool bar, 94
QSAR+ descriptors, 47
QSAR+ module, 2, 11, 13, 275
QSPR models, 233
quadratic polynomial spline terms, 243
quadratic polynomial terms, 242
quantitative structure-activity relationship See QSAR., 11
Quantum card decks, 8
quantum mechanical descriptors, 55
Query Database menu card, 6

R

R descriptor, 49
Random Sample, 184
randomization, 42
randomization test, 225
randomizing an equation population, 240
range, 229
recalculating descriptors, 195
Receptor
descriptor preferences, 139
receptor descriptors, 54
receptor geometry, 180
regression method, 94
regression methods, 12, 37
genetic partial least squares, 41
GFA, 40
linear, 38
PCR, 39
PLS, 39
simple, 38
stepwise, 39
regression methods, in generating equations, 246
Regression popup, 94
relationship, QSAR, 11, 275
reloading a Study Table, 107
relocation clustering, 35
removing outliers, 242
renaming equation sets, 256
resetting variables, 200, 202
residuals plot, 222
rotatable bonds, definition of, 142
Rotbonds descriptor, 85
row, 96
RSA descriptor
using, 144
RSA preferences, 140
R-squared (r2), 218
rune plot
displaying, 230
rune plots
of variables, generating, 19
Rune plots icon, 102
Runes icon, 231

S

S descriptor, 51
SAS format, export, 109
Save Descriptor Database control panel, 156
Save Session control panel, 106
saving a Study Table, 106
Scan for Empty Cells control panel, 103
scientific format, 155
SD file, 99
Select Conformers control panel
displaying, 194
selecting descriptors, 137
session, Cerius2, 107, 257
set
equation, 253, 256
training, 11
Set X icon, 100
Set Y icon, 100
shadow indices, 80
Shape Analysis menu card, 6
Shape Analysis (MSA) menu card, 6, 178
Active Conformation, 186
Generate Conformations..., 183
Select Conformers, 194
Shape Reference, 188, 190
shape descriptors, 180
conformation dependency, 182
shape index, 70
shape reference compound
displaying, 189
overriding default value, 189
selecting, 188-189
Shape Reference control panel, 189, 191
accessing, 188
displaying, 190
shape reference selection criteria
active conformation, 188
global minimum of most active molecule, 188
largest molecule (surface area), 188
largest molecule (volume), 188
selected study molecule, 188
ShapeRMS descriptor, 79
shortcuts
Study Table, 104
shortcuts, Study Table, 104
simple linear regression, 38, 214
selecting, 214
specify parameters, 214
Simple, see simple linear regression
Sketcher control panel, 111
skewness, 230
Sm descriptor, 48
SMILES file, 99
smoothing parameter, 245
source, 217
Sp descriptor, 48
spatial descriptors, 80
Spatial Descriptors control panel, 140
Spatial preferences, 140
specifying QSAR+ preferences, ??-117
splines
knot, 242
outlier removal, 242
range identification, 242
truncated power, 241
square of correlation coefficient, 45
Sr descriptor, 51
SRVol descriptor, 79
standard deviation, 229
statistical method, 94, 235
evaluating a QSAR equation, 216-??
generating QSARs, 207-??
genetic function approximation, 208-209, ??-210, ??-248
multiple linear regression, 210-??
partial least squares regression, 210-211, ??-214
selecting, 207-215
simple linear regression, 214
stepwise multiple linear regression, 214
Stats icon, 230
stepwise multiple linear regression, 39, 214
backward mode, 215
forward mode, 215
selecting, 215
specifying parameters, 215
Stepwise, see stepwise multiple linear regression
Sterimol-B1-B4 descriptors, 50
Sterimol-B5 descriptor, 50
Sterimol-L descriptor, 49
Structural Descriptors control panel, 142
structures
aligning, 180
congeneric, 182
generating conformers, 179
hypothesizing an active conformer, 179
minimizing, 182
ranking biological activities, 187
Study Table, 186, 190
Activity column, 15
adding Defaults Descriptor Set, 137
adding descriptors, 143
basic operations, 105
blank, 107
column, 96
components of, 94
conformer-related columns in, 128
connected to 2D plot, 22
contingent descriptor columns, 131
defined, 93
display current, 106
displaying, 106
edit window, 95
exporting, 109
illustrated, 94
menubar, 94
new, 107
observations, 96
opening .tbl files as, 108
QSAR tool bar, 94
Regression popup, 94
reloading, 107
row, 96
saving, 106
selecting rows, 22
shortcuts, 104
tool bar, 94
unique features, 93
updates to, 130
uses, 93
working with, ??-105
subgraph, 78
subgraph types, 60
subgraph, maximum common, 190
substitution sites, 191
sum, 229
sum of squared deviations, 21
sum squares, 217, 229
Summary Statistics icon, 103
superdelocalizability descriptor, 51
surface area, 82, 140

T

Table Properties control panel, 154
tables
column, 96
Conformers, 128
descriptive statistics, 229
export format, 109
opening as Study Table, 108
row, 96
Study Table, 93
tool bar, 94
Tables menu card, 9
Tables & Graphs card deck, 9
termination criteria, energy minimization, 116
terms, 78
linear polynomial, 241
linear spline, 241
quadratic polynomial, 242
quadratic polynomial spline, 243
types in GFA, 241
thermodynamic descriptors, 86
3D-Sketcher, 111
tool bar
QSAR, 94
Study Table, 94
table, 94
topological descriptors, 57
Topological descriptors preferences, 142
training set, 11
creating, 14
truncated power splines, 241

U

unassigned variables, 201

V

Validate icon, 225
Validate QSAR icon, 103, 225
validating equation, 20
validation, 41, 45
external, 46
internal, 45
validation methods
randomization test, 225
validation techniques, 12
variable indicators, 96
variables
changing the type of, 201
default, 197
default settings, 200, 202
defined, 197
dependent, 197
dependent/independent, exploring, 19
dependent/independent, setting, 18
descriptive statistics, generating, 20
identifying using icons, 198
independent, 197
indicators, 96, 199
resetting, 200, 202
selection of, 199
type, 201
unassigned, 201
working with, 197-203
Variables pulldown
Study Table, 100
variance, 229
Vertex adjacency/equality, 75
Vertex adjacency/magnitude, 76
Vertex distance/equality, 76
Vertex distance/magnitude, 76
vertex valence, 78
vertices
partitioning, 77
Visualizer, 2
Viswanadhan, V. N., 272
Vm descriptor, 85

W

Wendoloski, J. J., 272
Wiener Index, 57
windows
edit, 95

X

X Set icon, 198

Y

Y Set icon, 198

Z

Zagreb Index, 57

Numerics

2D Fingerprints Daylight control panel, 144
2D Fingerprints Isis Keys, 143
2D Plot icon, 102
3D Plot icon, 102
3D QSAR, 177
3D-Sketcher, 111

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Last updated May 18, 2000 at 05:51PM Pacific Daylight Time.
Copyright © 2000, Molecular Simulations Inc. All rights reserved.