Chains and heterogens:
PDB Chain Sequences:
>1z17A (A:) edikvavvgamsgpvaqygdqeftgaeqavadinakggikgnklqivkyddacdpkqava vankvvndgikyvighlcssstqpasdiyedegilmitpaatapeltargyqlilrttgl dsdqgptaakyilekvkpqriaivhdkqqygeglaravqdglkkgnanvvffdgitagek dfstlvarlkkenidfvyyggyhpemgqilrqaraaglktqfmgpegvanvslsniages aegllvtkpknydqvpankpivdaikakkqdpsgafvwttyaalqslqaglnqsddpaei akylkansvdtvmgpltwdekgdlkgfefgvfdwhangtatdak