Fig. 1

Photomicrographs of the developing canine embryo. The image on top shows all the structures (low magnification) that are enlarged in a–d; a high magnification of the parasagittal area of the hindbrain where rostro-caudal fibres and transverse fibres are visible; b high magnification of the developing semi-circular canal (transverse section) where epithelial immunoreactivity is visible as cytoplasmic staining; c high magnification of the cochlear ganglion showing cytoplasmic immunostaining of cell bodies; d high magnification of the outer layer of the optic cup (future pigmented layer of retina) showing cytoplasmic immunoreactivity. Scale bar is 500 µm in the top image and 20 µm in a–d