==== Secondary Structure Definition by the program DSSP, updated CMBI version by ElmK / April 1,2000 ==== DATE=13-DEC-2009 . REFERENCE W. KABSCH AND C.SANDER, BIOPOLYMERS 22 (1983) 2577-2637 . HEADER SIGNALING PROTEIN 21-JUN-04 1TRJ . COMPND 2 MOLECULE: HELIX 39 OF 18S RRNA; . SOURCE 2 SYNTHETIC: YES; . AUTHOR J.SENGUPTA,J.NILSSON,R.GURSKY,C.M.SPAHN,P.NISSEN,J.FRANK .