Chains and heterogens:
PDB Chain Sequences:
>2iffH (H:) xvqlqqsgaelmkpgasvkisckasgytfsdywiewvkqrpghglewigeilpgsgstny herfkgkatftadtssstaymqlnsltsedsgvyyclhgnydfdgwgqgttltvssaktt ppsvyplapgsaaqtnsmvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsdlytl sssvtvpssprpsetvtcnvahpasstkvdkkivp
>2iffH (H:) vqlqqsgaelmkpgasvkisckasgytfsdywiewvkqrpghglewigeilpgsgstnyh erfkgkatftadtssstaymqlnsltsedsgvyyclhgnydfdgwgqgttltvssakttp psvyplapgsaaqtnsmvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsdlytls ssvtvpssprpsetvtcnvahpasstkvdkkivp
>2iffL (L:) divltqspaimsaspgekvtmtcsasssvnymywyqqksgtspkrwiydtsklasgvpvr fsgsgsgtsysltissmetedaatyycqqwgrnptfgggtkleikradaaptvsifppss eqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysmsstltlt kdeyerhnsytceathktstspivksfnrnec
>2iffY (Y:) kvfgrcelaaamkrhgldnyrgyslgnwvcaakfesnfntqatnrntdgstdygilqins rwwcndgktpgsrnlcnipcsallssditasvncakkivsdgngmnawvawrnrckgtdv qawirgcrl