Fig. 2. Expression of BMP7 at the site of ciliary ganglion formation. In the environment of Phox2b-positive ciliary ganglion cells (CG, upper panel) BMP7 expression is detected in the retro-orbital mesenchyme (lower panel) by in situ hybridisation (stage 18/19). Stronger expression of BMP7 can be seen in Rathke's Pouch (RP) and in the retina. The location of the eye is indicated. Scale bar: 100 µm.