Abstract
The results of a combined autoradiographic and cytophotometric study show that primary spermatocytes of Urechis caupo incorporate about 2 to 4 times more tritiated arginine, lysine, or phenylalanine during S-phase than during G1 and G2 stage. This increased incorporation occurs mainly in histones which do not incorporate 3H-tryptophane and which are acid labile.
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