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Figure 3: A part of the 0.5 mm tertiary follicle with incipient cavity formation (CF). Follicular cells are placed on a clearly visible zona pellucida (ZP) and form corona radiata (CR). Fatty drops (arrow) can be seen in the cytoplasm of the oocyte (O) and chromatin in the nucleus (thick arrow). The membrana basalis (MB) is clearly visible separating the stratum granulosum (SG) from the theca interna (TI). (Ewe 32 days postpartum, staining H-E, 100 μm bar, 400x).