==== Secondary Structure Definition by the program DSSP, updated CMBI version by ElmK / April 1,2000 ==== DATE=23-JUL-2010 . REFERENCE W. KABSCH AND C.SANDER, BIOPOLYMERS 22 (1983) 2577-2637 . HEADER IMMUNE SYSTEM 26-AUG-05 2ATY . COMPND 2 MOLECULE: COMPLEMENT RECEPTOR CHIMERIC CONJUGATE CR2-IG; . SOURCE 2 ORGANISM_SCIENTIFIC: HOMO SAPIENS, MUS MUSCULUS; . AUTHOR H.E.GILBERT,M.ASLAM,J.M.GUTHRIDGE,V.M.HOLERS,S.J.PERKINS .