[modeller_usage] regarding chain identifiers ...

sorry to bother u with this simple question ...

I use following top script to extract sequences from pdb file '1PFZ'. works fine. But it reads all the different chain (A,B,C ..etc). what should i do if i want to get only sequence of chain A.

read_model FILE = '1PFZ', sequence_to_ali atom_files = '1PFZ', align_codes = 'gowtham' write_alignment file='seq.pir'

I tried the following and did not work read_model FILE = '1PFZ',MODEL_SEGMENT = '@:A' 'X:A'

#this works but writes only a chain break and * (/*) as a third line in output file 'seq.pir' many thanks in advance .... i could not get answer from list archives. i am sorry to bother you guys.