Chains and heterogens:
PDB Chain Sequences:
>4zzyA (A:) gpslksplkpesqldlrvqeliklicnvqameemmmemkyntkkaplgkltvaqikagyq slkkiedciragqhgralmeacnefytriphdfglrtpplirtqkelsekiqllealgdi eiaiklvktelqspehpldqhyrnlhcalrpldhesyefkvisqylqsthapthsdytmt lldlfevekdgekeafredlhnrmllwhgsrmsnwvgilshglriappeapitgymfgkg iyfadmssksanycfasrlkntgllllsevalgqcnelleanpkaegllqgkhstkglgk mapssahfvtlngstvplgpasdtgilnpdgytlnyneyivynpnqvrmryllkvqfnfl qlw
>4zzyA (A:) esqldlrvqeliklicnvqameemmmemkyntkkaplgkltvaqikagyqslkkiedcir agqhgralmeacnefytriphdfglrtpplirtqkelsekiqllealgdieiaiklvkte lqspehpldqhyrnlhcalrpldhesyefkvisqylqsthapthsdytmtlldlfevekd gekeafredlhnrmllwhgsrmsnwvgilshglriappeapitgymfgkgiyfadmssks anycfasrlkntgllllsevalgqcnelleanpkaegllqgkhstkglgkmapssahfvt lngstvplgpasdtgilngytlnyneyivynpnqvrmryllkvqfnflqlw