Abstract

Analysis of the oocyte-follicle interface during an oogenesis cycle revealed the development of a complex cell-to-cell interaction. A variety of ultrastructural methods revealed the presence of numerous gap junctions between oocyte microvilli and follicle cell processes during previtellogenesis and vitellogenesis. Junctions were not present during atresia of chorion formation. Fluorescent dyes, fluorescein, Procion yellow, and Lucifer yellow, passed from injected oocytes into follicle cells at all stages except chorion formation and during atresia. The numerous gap junctions presumably play important roles in coordination of oocyte-follicle cell differentiation.

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