Immunocytochemical identification of photoreceptor populations in the tree shrew retina.

The presence and retinal distributions of short-wavelength-sensitive cones, long-wavelength-sensitive cones, and rods were assessed in the retina of the tree shrew Tupaia belangeri using visual pigment antibodies OS-2, COS-1 and anti-rhodopsin, respectively. Results demonstrated a clear immunocytochemical differentiation of the three photoreceptor types with each showing regional variation in density across the retina.