Chains and heterogens:
PDB Chain Sequences:
>1ytw_ (-) vspygpearaelssrlttlrntlapatndprylqacggeklnrfrdiqcrrqtavradln anyiqvgntrtiacqyplqsqleshfrmlaenrtpvlavlassseianqrfgmpdyfrqs gtygsitveskmtqqvglgdgimadmytltireagqktisvpvvhvgnwpdqtavssevt kalaslvdqtaetkrnmyeskgssavaddsklrpvihcragvgrtaqligamcmndsrns qlsvedmvsqmrvqrngimvqkdeqldvliklaegqgrpllns