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Kikkawa U, Nishizuka Y, Igarashi K, Fujii T, Ono Y, Kuno T, Tanaka C (1989). «Phorbol ester binding to protein kinase C requires a cysteine-rich zinc-finger-like sequence». Proc. Natl. Acad. Sci. U.S.A.86 (13): 4868-4871. PMID2500657. doi:10.1073/pnas.86.13.4868.