Figure 8
From: Onset of meiosis in the chicken embryo; evidence of a role for retinoic acid
Expression of CYP26B1 mRNA during gonadal development in chicken embryos, assessed by whole mount in situ hybridisation. (A) In males, CYP26B1 is strongly expressed in both gonads, and not in mesonephric kidneys, throughout development. In females, expression is initially strong in both gonads, but declines from day 14.5. (B) In males, CYP26B1 expression localises to seminiferous cords in developing testes (arrow). In females, CYP26B1 is initially expressed in the medulla of both gonads, but becomes concentrated in the juxtacortical medulla (JCM) from day 12.5, and expression declines thereafter. The left cortex is always negative for CYP26B1 (e.g., arrow at 16.5). In the right gonad, expression persists in the medulla overdevelopment, declining at later stages.