Chains and heterogens:
PDB Chain Sequences:
>1a31A (A:) ikwkflehkgpvfappyeplpenvkfyydgkvmklspkaeevatffakmldheyttkeif rknffkdwrkemtneekniitnlskcdftqmsqyfkaqtearkqmskeeklkikeenekl lkeygfcimdnhkerianfkieppglfrgrgnhpkmgmlkrrimpediiincskdakvps pppghkwkevrhdnkvtwlvswteniqgsikyimlnpssrikgekdwqkyetarrlkkcv dkirnqyredwkskemkvrqravalyfidklalragnekeegetadtvgccslrvehinl hpeldgqeyvvefdflgkdsiryynkvpvekrvfknlqlfmenkqpeddlfdrlntgiln khlqdlmegltakvfrtynasitlqqqlkeltapdenipakilsynranravailcnhqr appktfeksmmnlqtkidakkeqlaqialgtsklnyldpritvawckkwgvpiekiynkt qrekfawaidmadedyef
>1a31A (A:) ikwkflehkgpvfappyeplpenvkfyydgkvmklspkaeevatffakmldheyttkeif rknffkdwrkemtneekniitnlskcdftqmsqyfkaqtearkqmskeeklkikeenekl lkeygfcimdnhkerianfkieppglfrgrgnhpkmgmlkrrimpediiincskdakvps pppghkwkevrhdnkvtwlvswteniqgsikyimlnpssrikgekdwqkyetarrlkkcv dkirnqyredwkskemkvrqravalyfidklalragnekeegetadtvgccslrvehinl hpeldgqeyvvefdflgkdsiryynkvpvekrvfknlqlfmenkqpeddlfdrlntgiln khlqdlmegltakvfrtynasitlqqqlkeltapdenipakilsynranravklnyldpr itvawckkwgvpiekiynktqrekfawaidmadedyef