STUDIES ON UNEQUAL CLEAVAGE IN SEA URCHINS I. MIGRATION OF THE NUCLEI TO THE VEGETAL POLE
- 31 December 1978
- journal article
- research article
- Published by Wiley in Development, Growth & Differentiation
- Vol. 21 (6) , 527-535
- https://doi.org/10.1111/j.1440-169x.1979.00527.x
Abstract
It has been known for nearly a century that at the 16-cell stage of sea urchin [Hemicentrotus pulcherrimus and Clypeaster japonicus] embryos, the animal 4 cells divide equally and horizontally, whereas the vegetal 4 cells cleave unequally and practically vertically into macromeres and micromeres. More careful observations were made on the process of micromere formation and it was revealed that a primary cause for the inequality lies in the migration of the 4 vegetal nuclei to the vegetal pole of the embryo which brings about eccentricity of the mitotic apparatus. Records of this phenomenon are given.This publication has 7 references indexed in Scilit:
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