ABSTRACT
An earlier study has demonstrated both the equipotentiality and the lability of the very young unincubated chick blastoderm (Eyal-Giladi & Spratt, 1965). It was observed that when a central cut was made in a blastoderm of this age, an embryo tended to form along the cut edge and the original embryo-forming centre at the prospective posterior side was suppressed. As the blastoderms grow older, the embryo-forming potency as expressed by the reaction to the cut is gradually lost from the central area, becomes confined to the marginal zone, and within it gradually to its posterior region.
Copyright © 1969 by Company of Biologists
1969
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