Chains and heterogens:
PDB Chain Sequences:
>1k6aA (A:) qaaqsvdqlikargkvyfgvatdqnrlttgknaaiiqadfgqvtpensmkwdatepsqgn fnfagadylvnwaqqngklirghtlvwhsqlpswvssitdkntltnvmknhittlmtryk gkirawdvvneafnedgslrqtvflnvigedyipiafqtaraadpnaklyindynldsas ypktqaivnrvkqwraagvpidgigsqthlsagqgagvlqalpllasagtpevaiteldv agasptdyvnvvnaclnvqscvgitvwgvadpdswrasttpllfdgnfnpkpaynaivqd lqq
>1k6aA (A:) qaaqsvdqlikargkvyfgvatdqnrlttgknaaiiqadfgqvtpensmkwdatepsqgn fnfagadylvnwaqqngklirghtlvwhsqlpswvssitdkntltnvmknhittlmtryk gkirawdvvneafnedgslrqtvflnvigedyipiafqtaraadpnaklyindynldsas ypktqaivnrvkqwraagvpidgigsqthlsagqgagvlqalpllasagtpevaiteldv agasptdyvnvvnaclnvqscvgitvwgvadpdswrasttpllfdgnfnpkpaynaivqd lq