By D. R. Garrod (auth.)
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Treatment of eggs with cytochalasin B (see Chapter 4) did not prevent the contracti1e phase, nor does it disrupt microftlaments. Rather, the effect of this substance seemed to be on the formation of inter-blastomeric adhesions and membrane growth. Furrow regression took place in cytochalasin B because adhesions failed to form and membrane growth seemed to be promoted . It has been shown that cortical contraction in Xenopus eggs can be induced by iontophoretic injection of calcium ions just beneath the surface membrane with a glass micro-electrode  .
2. Diagramatic seetions through the cleavage furrow in the animal region, at right angles to the plane of cleavage. (a) Early furrow showing loeation of microfilament ring beneath the surfaee membrane. (b) Half way through cleavage. ) the constriction of the cleavage furrow. In the amphibian, only the initial stages of furrow formation are thought to be produced by the fllament ring . Just after the stage when the furrow has passed half way through the egg, the advancing tip of the furrow seems to pass through the fllament ring, splitting it into two.
7. Primary embryonic induction. Primary embryonic induction, the formation of nervous system from the ectoderm overlying the dorsal invaginated mesoderm in vertebrate embryos, is the most commonly described patternforming mechanism in text books of embryology, so it will not be considered in detail here. It has been thought for some time that induction involves the transfer of specific substances from the mesoderm to the neurectoderm, and that these substances 'evoke' the neuralizing response. There is some evidence for two proteinaceous inducer substances, the archencephalic or neuralizing inducer and the spinocordal 31 or mesodennalizing inducer, which are supposed to interact to organize the pattern of the nervous system and other axial structures (see [107, 132,41]).
Cellular Development by D. R. Garrod (auth.)