The effect of light stimulation during the subjective day on plasma corticosterone and gene expression in the adrenal.

CT  =  circadian time 30 min light pulse was started; lux  =  light intensity in lux; CORT  =  plasma corticosterone; Per1  =  Period1 mRNA expression; Per2  =  Period 2 mRNA expression; TH  =  tyrosine hydroxylase mRNA expression; PNMT  =  phenylethanolamine N-methyltransferase mRNA expression; +  =  significant increase vs 0 lux; -  =  not significantly different vs 0 lux dark control; nd  =  not determined.