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• W2102897824 abstract "In spherical cells with a central mitotic apparatus, the centers of the asters are closer to the poles than to the equator. This circumstance is basic to several hypothetical explanations of the way in which the mitotic apparatus establishes the division mechanism. This investigation was designed to determine whether that geometrical relationship is necessary for division. Fertilized, mechanically denuded sand dollar eggs were inserted into glass loops, which reduced the diameter in the constriction plane from the normal 142 to 78–80 μm and partly constricted the cell into equal parts. The mitotic apparatus straddled the constriction, and its length was not significantly changed. The manipulation increased the distance from the astral centers to the poles and decreased the distance from the astral centers to the equator to a degree that reversed the normal distance relations. These cells divided normally. Ethyl urethane (0.06 M) reduces the size of the mitotic apparatus and blocks cleavage in spherical cells. When treated cells are confined in 80-μm i.d. capillaries, they divide. Treated cells also divide when they are constricted by an 80-μm i.d. glass loop if the mitotic apparatus straddles the constriction. An equal degree of constriction in the subfurrow and subpolar areas did not reverse the effect of urethane. The results demonstrate that cleavage does not depend on the normal distance relation between the mitotic apparatus and the poles, and that the urethane effect can be remedied only by reducing the distance between the mitotic apparatus and the equatorial surface. Both findings are inconsistent with the polar stimulation hypothesis." @default.
• W2102897824 created "2016-06-24" @default.
• W2102897824 creator A5017948152 @default.
• W2102897824 creator A5059498483 @default.
• W2102897824 date "1984-07-01" @default.
• W2102897824 modified "2023-09-23" @default.
• W2102897824 title "Division of constricted and urethane-treated sand dollar eggs: A test of the polar stimulation hypothesis" @default.
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• W2102897824 doi "https://doi.org/10.1002/jez.1402310111" @default.
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