“…Moreover, it appears that in the mammalian ovary, TGF-fil and [32 are functionally equivalent (Roy, 1993), and that their expression is differentially regulated, possibly by post-transcriptional control mechanisms that restrict their translation (Arrick et al, 1991). Furthermore, the thecal layer contains m a n y cell types, including macrophages and mast cells, both of which are capable of producing a variety of cytokines, including TGF-[3 (for a review see Mori, 1990). Previous studies in the chicken have shown that mast cells are present in the follicular walls (Wight, 1970;Gupta & Gilbert, 1988;Parshad & Kathpalia, 1993).…”