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Primordial follicles comprise an oocyte surrounded by a single layer of squamous epithelial cells, called pregranulosa cells (Peters, 1978; Greenwald and Terranova, 1988). Enlargement of the oocyte and initiation of granulosa cell division mark the beginning of follicular growth (Peters, 1978). Soon after initiation of growth, the pregranulosa cells, which form the simple squamous epithelium of...