Key

A, antrum

AF, atretic follicle

F, follicle cells, primordial

FC, follicle cells

GEp, germinal epithelium

N, nucleus of oocyte PF, primordial follicles SF, growing follicles TA, tunica albuginea

Tl, theca interna

X, oocyte showing only cytoplasm ZP, zona pellucida arrowhead, follicle cells seen en lace

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