- Structure of poly(adenosine diphosphate ribose): identification of 2'-[1''-ribosyl-2''-(or 3''-)(1'''-ribosyl)]adenosine-5',5'',5'''-tris(phosphate) as a branch linkage. Miwa, M., Saikawa, N., Yamaizumi, Z., Nishimura, S., Sugimura, T. Proc. Natl. Acad. Sci. U.S.A. (1979)