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Figure 4: A part of the 4.4 mm preovulatory follicle wall. The membrana basalis (MB) is clearly visible separating the stratum granulosum (SG) from the theca interna (TI), in which glandular cells are clearly differentiated (arrow). The theca externa (TE) consists of fibrocytes and vessels. (Ewe 17 days postpartum, staining Azan, 100 μm bar, 400x).