Histology and light responsiveness in the retina of wild-type, young, and
old mPer1-/- mCry2-/- mice. Gomori
trichrome (A) and lipofuscin (B) staining of retinal
sections of wild-type (first row), young mPer1-/- mCry2-/- (second row), old
mPer1-/- mCry2-/- (third row), mPer1-/- (fourth row), and
mCry2-/- mice (fifth row). Retinal layers are
indicated on the left. PRL, potoreceptor layer; ONL, outer nuclear
layer; OPL, outer plexiform layer; INL, inner nuclear layer; IPL, inner
plexiform layer; GCL, ganglion cell layer. (C) Immunohistochemistry
analysis of light-induced CREB Ser 133 phosphorylation in the retina.
(Left panels) Immunostained retinal sections of control animals
without light exposure. (Right panels) Animals 1 h after light
exposure (400 lx, 15 min) at ZT14. (D) Immunohistochemistry analysis
for (unphosphorylated) CREB in the retina at ZT14. Bar, 10 μm.