Chains and heterogens:
PDB Chain Sequences:
>1k4sA (A:) kkpknkdkdkkvpepdnkkkkpkkeeeqkwkwweeerypegikwkflehkgpvfappyep lpenvkfyydgkvmklspkaeevatffakmldheyttkeifrknffkdwrkemtneekni itnlskcdftqmsqyfkaqtearkqmskeeklkikeenekllkeygfcimdnhkerianf kieppglfrgrgnhpkmgmlkrrimpediiincskdakvpspppghkwkevrhdnkvtwl vswteniqgsikyimlnpssrikgekdwqkyetarrlkkcvdkirnqyredwkskemkvr qravalyfidklalragnekeegetadtvgccslrvehinlhpeldgqeyvvefdflgkd siryynkvpvekrvfknlqlfmenkqpeddlfdrlntgilnkhlqdlmegltakvfrtyn asitlqqqlkeltapdenipakilsynranravailcnhqrappktfeksmmnlqtkida kkeqladarrdlksakadakvmkdaktkkvveskkkavqrleeqlmklevqatdreenkq ialgtsklnyldpritvawckkwgvpiekiynktqrekfawaidmadedyef
>1k4sA (A:) qkwkwweeerypegikwkflehkgpvfappyeplpenvkfyydgkvmklspkaeevatff akmldheyttkeifrknffkdwrkemtneekniitnlskcdftqmsqyfkaqtearkqms keeklkikeenekllkeygfcimdnhkerianfkieppglfrgrgnhpkmgmlkrrimpe diiincskdakvpspppghkwkevrhdnkvtwlvswteniqgsikyimlnpssrikgekd wqkyetarrlkkcvdkirnqyredwkskemkvrqravalyfidklalragnekeegetad tvgccslrvehinlhpeldgqeyvvefdflgkdsiryynkvpvekrvfknlqlfmenkqp eddlfdrlntgilnkhlqdlmegltakvfrtynasitlqqqlkeltapdenipakilsyn ranravailcnhreenkqialgtsklnyldpritvawckkwgvpiekiynktqrekfawa idmadedyef