Chains and heterogens:
PDB Chain Sequences:
>1h21A (A:) grfdqvggafgwkphkldpkecaqvaydgywykgfgcgfgafysivglmgekygapynqf pfamleankggisdwgticgalygaaatfslfwgrkevhpmvnelfrwyevtklpifnpg daaqgvkgdlpmsasdsvlchisvskwcyenkieatskqrsercgrltadaafkaaeiin tkidqgkdfkstfpmqasvsscgechmtkgndanwakgimdctpchsgtaatqnkfvnhp
>1h21B (B:) grfdqvggafgwkphkldpkecaqvaydgywykgfgcgfgafysivglmgekygapynqf pfamleankggisdwgticgalygaaatfslfwgrkevhpmvnelfrwyevtklpifnpg daaqgvkgdlpmsasdsvlchisvskwcyenkieatskqrsercgrltadaafkaaeiin tkidqgkdfkstfpmqasvsscgechmtkgndanwakgimdctpchsgtaatqnkfvnhp
>1h21C (C:) grfdqvggafgwkphkldpkecaqvaydgywykgfgcgfgafysivglmgekygapynqf pfamleankggisdwgticgalygaaatfslfwgrkevhpmvnelfrwyevtklpifnpg daaqgvkgdlpmsasdsvlchisvskwcyenkieatskqrsercgrltadaafkaaeiin tkidqgkdfkstfpmqasvsscgechmtkgndanwakgimdctpchsgtaatqnkfvnhp
>1h21D (D:) grfdqvggafgwkphkldpkecaqvaydgywykgfgcgfgafysivglmgekygapynqf pfamleankggisdwgticgalygaaatfslfwgrkevhpmvnelfrwyevtklpifnpg daaqgvkgdlpmsasdsvlchisvskwcyenkieatskqrsercgrltadaafkaaeiin tkidqgkdfkstfpmqasvsscgechmtkgndanwakgimdctpchsgtaatqnkfvnhp