Chains and heterogens:
PDB Chain Sequences:
>1uswA (A:) astqgisedlynrlvematisqaayadlcnipstiikgekiynaqtdingwilrddtske iitvfrgtgsdtnlqldtnytltpfdtlpqcndcevhggyyigwisvqdqveslvkqqas qypdyaltvtghslgasmaaltaaqlsatydnvrlytfgeprsgnqafasymndafqvss pettqyfrvthsndgipnlppadegyahggveywsvdpysaqntfvctgdevqcceaqgg qgvndahttyfgmtsgactw