Abstract
Labelling of oviduct nuclear proteins was studied in vitro up to 4 h after estrogen stimulation of primed chicks. The incorporation of [ 3H]-leucine into histones slightly decreased and that into nonhistones increased by 30% after 4 h stimulation. The specific radioactivities of nonhistones were at least 3-fold higher than those of histones. Estrogen caused an increase in the labelling of nonhistones extractable with 0.35 M NaCl and unextractable residual proteins. The specific radioactivities of nonhistones were high in the nuclear matrix fraction and in the MgCl 2 soluble chromatin fraction as compared to the MgCl 2 insoluble chromatin fraction. Estrogen stimulation appeared to increase particularly the relative radioactivity of nonhistones of 50 000, 40 000 and 34 000 molecular weight.
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