Fig. 2. Representative northern blot of trkB (the high-affinity neurotrophin receptor of brain-derived neurotrophic factor) mRNA in granulosa cells (A) reveals three transcripts of approximately 9, 6.3 and 5kb. Levels of mRNA from granulosa and stroma tissues (B) and theca (C) were standardized to 18S rRNA and are expressed as fold difference compared with F1 follicle granulosa. Values are means + S.E.M. (N=3 replicate experiments). a and b denote significant differences (P<0.05) in levels of the 9kb transcript. Abbreviations are as described in the legend to Fig.1.