Chains and heterogens:
PDB Chain Sequences:
>3e91A (A:) sgfrkmafpsgkvegcmvqvtcgtttlnglwlddtvycprhvictaedmlnpnyedllir ksnhsflvqagnvqlrvighsmqncllrlkvdtsnpktpkykfvriqpgqtfsvlacyng spsgvyqcamrpnhtikgsflngscgsvgfnidydcvsfcymhhmelptgvhagtdlegk fygpfvdrqtaqaagtdttitlnvlawlyaavingdrwflnrftttlndfnlvamkynye pltqdhvdilgplsaqtgiavldmcaalkellqngmngrtilgaaaledeftpfdvvrqc sgvtfq
>3e91A (A:) sgfrkmafpsgkvegcmvqvtcgtttlnglwlddtvycprhvictaedmlnpnyedllir ksnhsflvqagnvqlrvighsmqncllrlkvdtsnpktpkykfvriqpgqtfsvlacyng spsgvyqcamrpnhtikgsflngscgsvgfnidydcvsfcymhhmelptgvhagtdlegk fygpfvdrqtaqaagtdttitlnvlawlyaavingdrwflnrftttlndfnlvamkynye pltqdhvdilgplsaqtgiavldmcaalkellqngmngrtilgaaaledeftpfdvvrqc sgvtf
>3e91B (B:) sgfrkmafpsgkvegcmvqvtcgtttlnglwlddtvycprhvictaedmlnpnyedllir ksnhsflvqagnvqlrvighsmqncllrlkvdtsnpktpkykfvriqpgqtfsvlacyng spsgvyqcamrpnhtikgsflngscgsvgfnidydcvsfcymhhmelptgvhagtdlegk fygpfvdrqtaqaagtdttitlnvlawlyaavingdrwflnrftttlndfnlvamkynye pltqdhvdilgplsaqtgiavldmcaalkellqngmngrtilgaaaledeftpfdvvrqc sgvtfq
>3e91B (B:) sgfrkmafpsgkvegcmvqvtcgtttlnglwlddtvycprhvictaedmlnpnyedllir ksnhsflvqagnvqlrvighsmqncllrlkvdtsnpktpkykfvriqpgqtfsvlacyng spsgvyqcamrpnhtikgsflngscgsvgfnidydcvsfcymhhmelptgvhagtdlegk fygpfvdrqtaqaagtdttitlnvlawlyaavingdrwflnrftttlndfnlvamkynye pltqdhvdilgplsaqtgiavldmcaalkellqngmngrtilgaaaledeftpfdvvrqc