Chains and heterogens:
PDB Chain Sequences:
>2xbkA (A:) mrgshhhhhhgshdlpclnleppkmlklspllralqdrgpihrvrtpagdeawlvtrhae lkqllhderigrthpdppsaaqyvrspfldllisdadaesgrrqhaetrrlltplfsarr vlemqpkveeaadtlldafiaqgppgdlhgeltvpfaltvlcevigvppqrraelttlla giaklddregavraqddlfgyvaglvehkraepgpdiisrlndgeltedrvahlamgllf agldsvasimdngvvllaahpdqraaaladpdvmaraveevlrtaraggsvlppryased mefggvtiragdlvlfdlglpnfderaftgpeefdaartpnphltfghgiwhcigaplar lelrtmftklftrlpelrpelpveqlrlkegqlsggfaelrvvw
>2xbkA (A:) dlpclnleppkmlklspllralqdrgpihrvrtpagdeawlvtrhaelkqllhderigrt hpdppsaaqyvrspfldllisdadaesgrrqhaetrrlltplfsarrvlemqpkveeaad tlldafiaqgppgdlhgeltvpfaltvlcevigvppqrraelttllagiaklddregavr aqddlfgyvaglvehkraepgpdiisrlndgeltedrvahlamgllfagldsvasimdng vvllaahpdqraaaladpdvmaraveevlrtaraggsvlppryasedmefggvtiragdl vlfdlglpnfderaftgpeefdaartpnphltfghgiwhcigaplarlelrtmftklftr lpelrpelpveqlrlkegqlsggfaelrvvw