Chains and heterogens:
PDB Chain Sequences:
>1gokA (A:) eaaqsvdqlikargkvyfgvatdqnrlttgknaaiiqadfgqvtpensmkwdatepsqgn fnfagadylvnwaqqngklirghtlvwhsqlpswvssitdkntltnvmknhittlmtryk gkirawdvvneafnedgslrqtvflnvigedyipiafqtaraadpnaklyindynldsas ypktqaivnrvkqwraagvpidgigsqthlsagqgagvlqalpllasagtpevaiteldv agasptdyvnvvnaclnvqscvgitvwgvadpdswrasttpllfdgnfnpkpaynaivqd lqq