Abstract:This paper describes classical experiments of experimental embryology which may be repeated at class level using the early embryos of Xenopus /aevis. The experiments demonstrate the effects of lithium on the early development of the nervous system, and the use of hypertonic salt solutions to produce exogastrulation. Both experiments involve the removal of the jelly coats around the embryo, and for this purpose a rapid chemical method using a cysteine hydrochloride/papain solution is described. Both experiments… Show more
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