Differentiation during Cleavage in Xenopus laevis. I

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  • Acquisition of Self-differentiation Capacity of the Dorsal Marginal Zone

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1) The dorsal marginal zone of Xenopus laevis embryos at st. 6, 61/2, 7, 8 and 9 was dissected out and cultured in vitro.<br>2) At st. 6, only one explant, presumably taken from an unusually premature embryo, developed into axial organs, some other specimens forming sucker.<br>3) The capacity for self-differentiation of the zone into mesodermal axial organs becomes conspicuous at st. 61/2. Embryos with this capacity increases at st. 7 and come to the full at st. 8.<br>4) It is concluded that, as in Triturus, the capacity for self-differentiation of the dorsal marginal zone is not preexistent in Xenopus embryos but is aquired during cleavage; i.e. at st. 61/2 to st. 8, a little earlier than in Triturus.<br>5) The first appearance of this capacity precedes the rapid synthesis of “heterogeneous” RNA recently reported, while the rapid increase in the percentage of embryos with this capacity during st. 7 and st. 8 is parallel with the latter.

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