Chains and heterogens:
PDB Chain Sequences:
>1ucuA (A:) aqvintnslslltqnnlnksqsalgtaierlssglrinsakddaagqaianrftanikgl tqasrnandgisiaqttegalneinnnlqrvrelavqsanstnsqsdldsiqaeitqrln eidrvsgqtqfngvkvlaqdntltiqvgandgetididlkqinsqtlgldtlnvqqkykv sdtaatvtgyadttialdnstfkasatglggtdqkidgdlkfddttgkyyakvtvtggtg kdgyyevsvdktngevtlaggatspltgglpatatedvknvqvanadlteakaaltaagv tgtasvvkmsytdnngktidgglavkvgddyysatqnkdgsisinttkytaddgtsktal nklggadgktevvsiggktyaaskaeghnfkaqpdlaeaaatttenplqkidaalaqvdt lrsdlgavqnrfnsaitnlgntvnnltsvrsriedsdyatevsnmsraqilqqagtsvla qanqvpqnvlsllr