Rapid appearance of multivesicular bodies in the cortex of Drosophila eggs at ovulation

Following activation of Drosophila oocytes, acid phosphatase-positive multivesicular bodies (MVB) rapidly form in the cortex. From observations of eggs during the first few minutes of activation, MVBs are thought to form from invaginations of the oolemma. Since there is no evidence for turnover of vitellogenin receptors at earlier times, it is postulated that these receptors are synchronously removed at activation.