Abstract
The effects of non-histone chromosomal proteins from adult liver on neural induction and differentiation of induced derivatives, were studied in the Salamanders Ambystoma mexicanum and Pleurodeles waltlii. The treatment of ectoderm or/and blastoporal lip prior to their association, shows that these proteins do not alter the competence of the reacting tissue (ectoderm) or the inductive activity of the inducing tissue (blastoporal lip). Very strong inhibitory effects on cytodifferentiation can be brought about by continuous treatment, but only with homospecific proteins. In contrast, non histone proteins extracted from the liver of other animal species have no effect. Species-specific inhibitory effects of non-histone chromosomal proteins extracted from an adult tissue, on the differentiation of another embryonic tissue are thus demonstrated. They are compared with those previously studied in cultures of differentiating embryonic cells from Pleurodeles waltlii and Ambystoma mexicanum or on the morphogenesis of these embryos.
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