Tension at the Surface of the Dividing Sea-Urchin Egg
Journal of Experimental Biology1972Vol. 57(3), pp. 575–587
Citations Over TimeTop 10% of 1972 papers
Abstract
ABSTRACT Several theories have been put forward to explain the mechanics of cleavage of animal cells. According to the expanding membrane theory of Mitchison and Swann (Mitchison, 1952; Mitchison & Swann, 1955; Swann & Mitchison, 1958), the cleaving furrow is passively pushed in as a result of ‘active’ expansion of poles; while the constricting ring theory (Marsland, 1950, 1956 a, b) anticipates that the furrow region has independent power to contract. A third alternative is ‘astral relaxation theory’ of Wolpert (1960), who advocates that cleavage is initiated by relaxation of the membrane in the polar region which allows the furrow to contract.
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