Chains and heterogens:
PDB Chain Sequences:
>1bt3A (A:) apiqapeiskcvvppadlppgavvdnccppvasnivdyklpavttmkvrpaahtmdkdai akfakavelmkalpaddprnfyqqalvhcaycnggydqvnfpdqeiqvhnswlffpfhrw ylyfyerilgkligdpsfglpfwnwdnpggmvlpdflndstsslydsnrnqshlppvvvd lgyngadtdvtdqqritdnlalmykqmvtnagtaelflgkayragdapspgagsietsph ipihrwvgdprntnnedmgnfysagrdiafychhsnvdrmwtiwqqlagkprkrdytdsd wlnatflfydengqavkvrigdsldnqkmgykyaktplpwldskp
>1bt3A (A:) apiqapeiskcvvppadlppgavvdnccppvasnivdyklpavttmkvrpaahtmdkdai akfakavelmkalpaddprnfyqqalvhcaycnggydqvnfpdqeiqvhnswlffpfhrw ylyfyerilgkligdpsfglpfwnwdnpggmvlpdflndstsslydsnrnqshlppvvvd lgyngadtdvtdqqritdnlalmykqmvtnagtaelflgkayragdapspgagsietsph ipihrwvgdprntnnedmgnfysagrdiafychhsnvdrmwtiwqqlardytdsdwlnat flfydengqavkvrigdsldnqkmgykyaktplpwl