Chains and heterogens:
PDB Chain Sequences:
>1fx0A (A:) kvvntgtvlqvgdgiarihgldevmagelvefeegtigialnlesnnvgvvlmgdglmiq egssvkatgriaqipvseaylgrvinalakpidgrgeitasesrliespapgimsrrsvy eplqtgliaidamipvgrgqreliigdrqtgktavatdtilnqqgqnvicvyvaigqkas svaqvvtnfqergameytivvaetadspatlqylapytgaalaeyfmyrerhtliiyddl skqaqayrqmslllrrppgreaypgdvfylhsrlleraaklssllgegsmtalpivetqa gdvsayiptnvisitdgqiflsadlfnagirpainvgisvsrvgsaaqikamkkvagklk lelaqfaeleafaqfasdldkatqnqlargqrlrellkqpqsapltveeqvmtiytgtng yldsleldqvrkylvelrtyvktnkpefqeiisstktfteeaeallkeaiqeqmerf
>1fx0B (B:) nlgriaqiigpvlnvafppgkmpniynalivkgrdtagqpmnvtcevqqllgnnrvrava msatdgltrgmevidtgaplsvpvggptlgrifnvlgepvdnlrpvdtrttspihrsapa ftqldtklsifetgikvvnllapyrrggkiglfggagvgktvlimelinniakahggvsv fggvgertregndlymemkesgvineqniaeskvalvygqmneppgarmrvgltaltmae yfrdvneqdvllfidnifrfvqagsevsallgrmpsavgyqptlstemgslqeritstke gsitsiqavyvpaddltdpapattfahldattvlsrglaakgiypavdpldststmlqpr ivgeehyeiaqrvketlqrykelqdiiailgldelseedrltvararkierflsqpffva evftgspgkyvglaetirgfqlilsgeldslpeqafylvgnideata