Chains and heterogens:
PDB Chain Sequences:
>1pxaA (A:) mktqvaiigagpsglllgqllhkagidnvilerqtpdyvlgriragvleqgmvdllreag vdrrmardglvhegveiafagqrrridlkrlsggktvtvygqtevtrdlmeareacgatt vyqaaevrlhdlqgerpyvtferdgerlrldcdyiagcdgfhgisrqsipaerlkvferv ypfgwlglladtppvsheliyanhprgfalcsqrsatrsryyvqvplsekvedwsderfw telkarlpsevaeklvtgpsleksiaplrsfvvepmqhgrlflagdaahivpptgakgld laasdvstlyrlllkayregrgellerysaiclrriwkaerfswwmtsvlhrfpdtdafs qriqqteleyylgseaglatiaenyvglpyeeie