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Nakajima M, Imai K, Ito H, Nishiwaki T, Murayama Y, Iwasaki H, Oyama T, Kondo T (2005). "Reconstitution of circadian oscillation of cyanobacterial KaiC phosphorylation in vitro". Science. 308: 414–415. doi:10.1126/science.1108451. PMID15831759.