Chains and heterogens:
PDB Chain Sequences:
>1pwyE (E:) engytyedykntaewllshtkhrpqvaiicgsglggltdkltqaqifdyseipnfprstv pghagrlvfgflngracvmmqgrfhmyegyplwkvtfpvrvfhllgvdtlvvtnaaggln pkfevgdimlirdhinlpgfsgqnplrgpnderfgdrfpamsdaydrtmrqralstwkqm geqrelqegtyvmvagpsfetvaecrvlqklgadavgmstvpevivarhcglrvfgfsli tnkvimdyeslekanheevlaagkqaaqkleqfvsilmasiplpdkas