In comparison with the large number of investigations performed on the cleavage of sea-urchin eggs, those on the cleavage of amphibian eggs are surprisingly scanty. Recent works are almost limited to two papers from Edinburgh by Waddington (1952) and by Selman & Waddington (1955). The present report is an amplification of the works of the British investigators.
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Dan et al. (1963) studied this question.
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