Chains and heterogens:
PDB Chain Sequences:
>1u54A (A:) gsagegplqsltcligekdlrlleklgdgsfgvvrrgewdapsgktvsvavkclkpdvls qpeamddfirevnamhsldhrnlirlygvvltppmkmvtelaplgslldrlrkhqghfll gtlsryavqvaegmgyleskrfihrdlaarnlllatrdlvkigdfglmralpqnddhyvm qehrkvpfawcapeslktrtfshasdtwmfgvtlwemftygqepwiglngsqilhkidke gerlprpedcpqdiynvmvqcwahkpedrptfvalrdflleaqptdmraef
>1u54A (A:) qsltcligekdlrlleklgdgvvrrgewdapsgktvsvavkclamddfirevnamhsldh rnlirlygvvltppmkmvtelaplgslldrlrkhqghfllgtlsryavqvaegmgylesk rfihrdlaarnlllatrdlvkigdfglmralpqnddhyvmqehrvpfawcapeslktrtf shasdtwmfgvtlwemftygqepwiglngsqilhkidkegerlprpedcpqdiynvmvqc wahkpedrptfvalrdflleaqp
>1u54B (B:) gsagegplqsltcligekdlrlleklgdgsfgvvrrgewdapsgktvsvavkclkpdvls qpeamddfirevnamhsldhrnlirlygvvltppmkmvtelaplgslldrlrkhqghfll gtlsryavqvaegmgyleskrfihrdlaarnlllatrdlvkigdfglmralpqnddhyvm qehrkvpfawcapeslktrtfshasdtwmfgvtlwemftygqepwiglngsqilhkidke gerlprpedcpqdiynvmvqcwahkpedrptfvalrdflleaqptdmraef
>1u54B (B:) ltcligekdlrlleklgdgvvrrgewdapsgktvsvavkcleamddfirevnamhsldhr nlirlygvvltppmkmvtelaplgslldrlrkhqghfllgtlsryavqvaegmgyleskr fihrdlaarnlllatrdlvkigdfglmralpqnddhyvmqehrkvpfawcapeslktrtf shasdtwmfgvtlwemftygqepwiglngsqilhkidkegerlprpedcpqdiynvmvqc wahkpedrptfvalrdfllea