Abstract
ABSTRACT There is considerable current interest in the study of regularities and modes of regulation of cell cycles in the course of development (Dettlaff, 1964; Graham, Arms & Gurdon, 1966; Chulitskaia, 1967 a). The period of cleavage divisions is a very suitable object for such investigations. It consists of two different periods known as periods of synchronous and asynchronous cell divisions (Syngayewskaya, 1931; Balinsky, 1931; Costello, 1955; Sirakami, 1958; Neyfakh & Rott, 1959; Dan, 1960; Pankova, 1963; Agrell, 1964; Engelberg, 1964; Skoblina, 1965; Chulitskaia, 1967 ó ; Rott & Sheveleva, 1968). Peculiarities of these two periods are known rather well but regularities of the transition from synchronous to asynchronous divisions are still imperfectly understood (Rückert, 1899; Hoff-Jorgensen & Zeuthen, 1952; Agrell & Person, 1956; Neyfakh & Rott, 1959; Neyfakh, 1961; Agrell, 1961, 1962; Pankova, 1963; Brown, 1965; Bachvarova, Davidson, Allfrey & Mirsky, 1966; Timofeeva, Kafiani & Neyfakh, 1967; Chulitskaia, 1967a, b; Rott & Sheveleva, 1968).
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