Fig. 27. In situ hybridization analysis of follicle-stimulating hormone (FSH) receptor mRNA in developing human follicles. A. Bright-field photomicrograph after hybridization with 35 S-labeled hFSH receptor cRNA probe. cGC, cumulus granulosa cells; mGC, membrana granulosa cells; TI, theca interna; TE, theca externa. B. Dark-field photomicrograph of the same subject as in A. The hybridization signal appears as white grains. All the granulosa cells express FSH receptor mRNA. (GF Erickson and S Shimasaki, unpublished data.)