Chains and heterogens:
PDB Chain Sequences:
>3n20A (A:) msmlkredwydltrttnwtpkyvtenelfpeemsgargismeawekydepykitypeyvs iqrekdsgaysikaalerdgfvdradpgwvstmqlhfgaialeeyaastaearmarfaka pgnrnmatfgmmdenrhgqiqlyfpyanvkrsrkwdwahkaihtnewaaiaarsffddmm mtrdsvavsimltfafetgfvnmqflglaadaaeagdhtfaslissiqtdesrhaqqggp slkilvengkkdeaqqmvdvaiwrswklfsvltgpimdyytplesrnqsfkefmlewiva qferqlldlgldkpwywdqfmqdldethhgmhlgvwywrptvwwdpaagvspeerewlee kypgwndtwgqcwdvitdnlvngkpeltvpetlpticnmcnlpiahtpgnkwnvkdyqle yegrlyhfgseadrwcfqidperyenhtnlvdrflkgeiqpadlagalmymslepgvmgd dahdyewvkayqkktnaa
>3n20A (A:) smlkredwydltrttnwtpkyvtenelfpeemsgargismeawekydepykitypeyvsi qrekdsgaysikaalerdgfvdradpgwvstmqlhfgaialeeyaastaearmarfakap gnrnmatfgmmdenrhgqiqlyfpyanvkrsrkwdwahkaihtnewaaiaarsffddmmm trdsvavsimltfafetgfvnmqflglaadaaeagdhtfaslissiqtdesrhaqqggps lkilvengkkdeaqqmvdvaiwrswklfsvltgpimdyytplesrnqsfkefmlewivaq ferqlldlgldkpwywdqfmqdldethhgmhlgvwywrptvwwdpaagvspeerewleek ypgwndtwgqcwdvitdnlvngkpeltvpetlpticnmcnlpiahtpgnkwnvkdyqley egrlyhfgseadrwcfqidperyenhtnlvdrflkgeiqpadlagalmymslepgvmgdd ahdyewvkayq
>3n20B (B:) mseqqpealkplktwshlagnrrrpseyevvstnlhyftdnperpweldsnlpmqtwykk ycfdsplkhddwnafrdpdqlvyrtynllqdgqesyvqglfdqlndrghdqmltrewvet larfytparylfhalqmgsvyihqiapastitncatyetadhlrwlthtayrtrelancy pdvgfgkrerdvwendpawqgfreliekaliawdwgeaftainlvtkpaveeallqqlgs laqsegdtllgllaqaqkrdaerhrrwssalvkmalekegnrevlqkwvakwepladkai eaycsalpdgenaiveaksasryvrqmmgl
>3n20B (B:) alkplktwshlagnrrrpseyevvstnlhyftdnperpweldsnlpmqtwykkycfdspl khddwnafrdpdqlvyrtynllqdgqesyvqglfdqlndrghdqmltrewvetlarfytp arylfhalqmgsvyihqiapastitncatyetadhlrwlthtayrtrelancypdvgfgk rerdvwendpawqgfreliekaliawdwgeaftainlvtkpaveeallqqlgslaqsegd tllgllaqaqkrdaerhrrwssalvkmalekegnrevlqkwvakwepladkaieaycsal pdgenaiveaksasryvrqmmg
>3n20C (C:) matfpimsnferdfviqlvpvdtedtmdqvaekcayhsinrrvhpqpekilrvrrhedgt lfprgmivsdaglrptetldiifmdn
>3n20C (C:) tfpimsnferdfviqlvpvdtedtmdqvaekcayhsinrrvhpqpekilrvrrhedgtlf prgmivsdaglrptetldiifmd