Chains and heterogens:
PDB Chain Sequences:
>1a31A (A:) kpknkdkdkkvpepdnkkkkpkkeeeqkwkwweeerypegikwkflehkgpvfappyepl penvkfyydgkvmklspkaeevatffakmldheyttkeifrknffkdwrkemtneeknii tnlskcdftqmsqyfkaqtearkqmskeeklkikeenekllkeygfcimdnhkerianfk ieppglfrgrgnhpkmgmlkrrimpediiincskdakvpspppghkwkevrhdnkvtwlv swteniqgsikyimlnpssrikgekdwqkyetarrlkkcvdkirnqyredwkskemkvrq ravalyfidklalragnekeegetadtvgccslrvehinlhpeldgqeyvvefdflgkds iryynkvpvekrvfknlqlfmenkqpeddlfdrlntgilnkhlqdlmegltakvfrtyna sitlqqqlkeltapdenipakilsynranravailcnhqrappktfeksmmnlqtkidak keqlaqialgtsklnyldpritvawckkwgvpiekiynktqrekfawaidmadedyef
>1a31A (A:) ikwkflehkgpvfappyeplpenvkfyydgkvmklspkaeevatffakmldheyttkeif rknffkdwrkemtneekniitnlskcdftqmsqyfkaqtearkqmskeeklkikeenekl lkeygfcimdnhkerianfkieppglfrgrgnhpkmgmlkrrimpediiincskdakvps pppghkwkevrhdnkvtwlvswteniqgsikyimlnpssrikgekdwqkyetarrlkkcv dkirnqyredwkskemkvrqravalyfidklalragnekeegetadtvgccslrvehinl hpeldgqeyvvefdflgkdsiryynkvpvekrvfknlqlfmenkqpeddlfdrlntgiln khlqdlmegltakvfrtynasitlqqqlkeltapdenipakilsynranravklnyldpr itvawckkwgvpiekiynktqrekfawaidmadedyef