Proportion of cells among the retinal nuclear layers that express the core circadian clock components.

Retinas were collected around ZT02 during a LD cycle. Cells were identified by DAPI staining of their nucleus. Significant clock protein expression was defined as fluorescent level higher than 150% background. The number of positive cells/total number of cells counted is indicated between parentheses. Data shown are averaged values from 3–5 animals (3 pictures from 3 different sections per animal) ± SEM.