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ZP3 expression on growing preantral follicles and development of secondary Balbiani body in small antral follicles. A: Resting primary follicles express ZP1, ZP2 and ZP4[172], but lack ZP3 expression; Growing preantral follicles show oocyte ZP3 expression (B), but lack the secondary CK+ Balbiani body (C); which develops in the small antral follicles (blue arrowhead in D)[46]. ZP: Zona pellucida glycoprotein.
