Apoptosis in pre-ovulatory follicles of C. gariepinus. A, engulfed yolk, disintegrated zona ratiata, hypertrophic theca cells, invading granulosa cells; B, apoptotic body formation is shown. Ap, apoptotic body; Y, yolk; V, vacuole; T, theca; Zr, zona radiata; A, atrium. Scale bar, 200µm. Stain: hematoxylin & eosin.