Abstract
After centrifugation of adult quail oocytes, RNA-containing structures move in a centrifugal direction. By a moderate-speed centrifugation of quail oocytes at the end of the lampbrush or beginning postlampbrush chromosome stage, one can demonstrate that the germinal vesicle has a lower density than the surrounding ooplams. This indicates that the formation of the post-lampbrush stage and accompanying development of the germinal disc is codetermired by a gravitational (epigenetic) phenomenon. With increase in diameter of the oocyte, the cohesion between its cytoplasmic constituents progressively diminishes. The localization of the RNA-rich basophilic cortical layer after centrifugation can be followed accordingly as the oocyte grows: from a cap at the centrifugal pole in late lampbrush stage, it is progressively pushed centripetally by the peripherally formed heavy yolk that accumulates centrifugally during the postlampbrush stage.
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