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Immunogold labeling of Yl in multivesicular bodies. In stage 8 to early stage 9 chambers, multivesicular bodies with dense labeling of Yolkless were frequently observed. In some instances (A), the labeling is distributed throughout the MVB; in other MVBs (B), electron-dense yolk is segregated from the receptor-labeled regions. In B, the cortex of the oocyte is at the right, showing active endocytosis. Magnification: A, 53,000×; B, 53,000×.
