==== Secondary Structure Definition by the program DSSP, updated CMBI version by ElmK / April 1,2000 ==== DATE=11-DEC-2009 . REFERENCE W. KABSCH AND C.SANDER, BIOPOLYMERS 22 (1983) 2577-2637 . HEADER HYDROLASE(ENDORIBONUCLEASE) 05-MAR-93 1RDH . COMPND 2 MOLECULE: HIV-1 REVERSE TRANSCRIPTASE (RIBONUCLEASE H . SOURCE 2 ORGANISM_SCIENTIFIC: HUMAN IMMUNODEFICIENCY VIRUS 1; . AUTHOR B.C.FINZEL,D.CHATTOPADHYAY,H.M.EINSPAHR .