||Fig. 6. Voltage-dependent potassium 4.2 (Kv4.2)–like subunits are
expressed in the Xenopus retina. Transverse sections through Xenopus
retinas at different developmental stages. A: Kv4.2-like immunoreactivity
is first detectable at stage 24 in the retina with labelling in
the basal lamina surrounding the eye primordium (arrowhead). B: At
stage 28, additional labelling is observed in radially oriented fibres
(arrowhead), processes along the vitreal surface of the retina (arrow),
and cell bodies. C: Higher magnification picture demonstrates staining
of processes along the vitreal surface (vs) in a stage 30 retina.
Arrows point to immunolabelling of the basal lamina. D: At stage
37/38, and earlier at stage 35/36, radial cell processes and a subset of
retinal ganglion cell and cells in the outer nerve layer (ONL) are
immunopositive for the Kv4.2-like protein. D, dorsal; Di, diencephalon;
Ep, eye primordium; IPL, inner plexiform layer; L, lens; RGCL,
retinal ganglion cell layer; V, ventral. Scale bar 200 m for A and
B and 100 m for C and D.