==== Secondary Structure Definition by the program DSSP, updated CMBI version by ElmK / April 1,2000 ==== DATE=3-DEC-2009 . REFERENCE W. KABSCH AND C.SANDER, BIOPOLYMERS 22 (1983) 2577-2637 . HEADER CHROMOSOMAL PROTEIN 19-SEP-91 1HIO . COMPND 2 MOLECULE: HISTONE H2A; . SOURCE 2 ORGANISM_SCIENTIFIC: GALLUS GALLUS; . AUTHOR G.ARENTS,E.N.MOUDRIANAKIS .