Paul Yadlowsky , you may want to check out what Laura Lynn Walsh at
the Beckman Institute University of Illinois has done. She has compiled
a complete Annotated Guide to the PDB, which contains in an abbreviated
form all kinds of information regarding numbers of chains, domains,
residues in each structure. You could write a program to search this
file and pull out the information you want concerning whether statistically
are 200 amino acid proteins liable to be in one or more chains...
You can obtain this annotated guide to the PDB via anonymous ftp:
ftp infomeister.osc.edu
cd /pub/chemistry/documents/PDB/PDB_file_list
get pdb_annot_jan94.txt
get pdb_annot_jan94
get pdb_seq_rel_jan94
quit
for further info Laura Walsh's e-mail address is lwalsh at silibio.ncsa.uiuc.edu