“…Thirty minutes after irradiation, histones and globulins are liberated from nuclear structures (Ernst 1963 a, b) and released into the cytoplasm of lymphocytes (Whitfield, Brohee andYoudale 1964, Whitfield and . But an early report of post-irradiation decrease in the histone-to-DNA ratio in spleen and thymus (Ernst 1962) has not yet been confirmed (Telia, Reuter, Gerber and Kennes 1969) . Moreover, phosphorylation of histones, which may cause a dissociation of histones from the DNA in nucleoprotein, is depressed after irradiation (Ord andStocken 1966, Betel, Appelman andGraver 1970) .…”