Chains and heterogens:
PDB Chain Sequences:
>1bt1A (A:) apiqapeiskcvvppadlppgavvdnccppvasnivdyklpavttmkvrpaahtmdkdai akfakavelmkalpaddprnfyqqalvhcaycnggydqvnfpdqeiqvhnswlffpfhrw ylyfyerilgkligdpsfglpfwnwdnpggmvlpdflndstsslydsnrnqshlppvvvd lgyngadtdvtdqqritdnlalmykqmvtnagtaelflgkayragdapspgagsietsph ipihrwvgdprntnnedmgnfysagrdiafychhsnvdrmwtiwqqlagkprkrdytdsd wlnatflfydengqavkvrigdsldnqkmgykyaktplpwldskp
>1bt1A (A:) apiqapeiskcvvppadlppgavvdnccppvasnivdyklpavttmkvrpaahtmdkdai akfakavelmkalpaddprnfyqqalvhcaycnggydqvnfpdqeiqvhnswlffpfhrw ylyfyerilgkligdpsfglpfwnwdnpggmvlpdflndstsslydsnrnqshlppvvvd lgyngadtdvtdqqritdnlalmykqmvtnagtaelflgkayragdapspgagsietsph ipihrwvgdprntnnedmgnfysagrdiafychhsnvdrmwtiwqqlardytdsdwlnat flfydengqavkvrigdsldnqkmgykyaktplpwl
>1bt1B (B:) apiqapeiskcvvppadlppgavvdnccppvasnivdyklpavttmkvrpaahtmdkdai akfakavelmkalpaddprnfyqqalvhcaycnggydqvnfpdqeiqvhnswlffpfhrw ylyfyerilgkligdpsfglpfwnwdnpggmvlpdflndstsslydsnrnqshlppvvvd lgyngadtdvtdqqritdnlalmykqmvtnagtaelflgkayragdapspgagsietsph ipihrwvgdprntnnedmgnfysagrdiafychhsnvdrmwtiwqqlagkprkrdytdsd wlnatflfydengqavkvrigdsldnqkmgykyaktplpwldskp
>1bt1B (B:) apiqapeiskcvvppadlppgavvdnccppvasnivdyklpavttmkvrpaahtmdkdai akfakavelmkalpaddprnfyqqalvhcaycnggydqvnfpdqeiqvhnswlffpfhrw ylyfyerilgkligdpsfglpfwnwdnpggmvlpdflndstsslydsnrnqshlppvvvd lgyngadtdvtdqqritdnlalmykqmvtnagtaelflgkayragdapspgagsietsph ipihrwvgdprntnnedmgnfysagrdiafychhsnvdrmwtiwqqlardytdsdwlnat flfydengqavkvrigdsldnqkmgykyaktplpwl