Chains and heterogens:
PDB Chain Sequences:
>1usgA (A:) ddikvavvgamsgpiaqwgdmefngarqaikdinakggikgdklvgveyddacdpkqava vankivndgikyvighlcssstqpasdiyedegilmispgatnpeltqrgyqhimrtagl dssqgptaakyiletvkpqriaiihdkqqygeglarsvqdglkaananvvffdgitagek dfsaliarlkkenidfvyyggyypemgqmlrqarsvglktqfmgpegvgnaslsniagda aegmlvtmpkrydqdpanqgivdalkadkkdpsgpyvwityaavqslatalertgsdepl alvkdlkangantvigplnwdekgdlkgfdfgvfqwhadgsstkak