A quick and dirty approach: Ramachandran plot...I have Fortran
code available for taking .pdb files and generating said plots from
these coordinates. It might not be as sophisticated as you're looking
for, but it would at least allow some classification.
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Kevin Gardner
Yale University Dept. of Molecular Biophysics and Biochemistry
Internet: gardner at zinc.med.yale.edu Bitnet: gardner at yalemed