The Inductive Tissues
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Although we have just summarised the literature which indicates that neither the notochord nor the spinal cord provide information to the somites which is essential for somitic chondrogenesis to commence in vitro, it is evident that these tissues dp provide developmental information to the somites in vivo. In vitro we are able to by-pass the inducer by using conditioned medium but the embryo is not able to compensate for the absence of the spinal cord or of the notochord, so that, in vivo these tissues are prerequisites for somitic chondrogenesis. There seems therefore, to be justification for continuing to refer to them as inducers and to their interaction with the somites as an inductive interaction.
KeywordsSpinal Cord Chick Embryo Inductive Ability Chorioallantoic Membrane Neural Arch
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