Figure 3. Expression of clock-related genes in the submandibular glands in Clock/Clock mice. Wild-type (WT) and Clock/Clock (Ck/Ck) mice were housed under LD conditions and killed at ZT6 or ZT18. Per2, Bmal1, Dbp, Dec1, Dec2, and Amy1 mRNA levels (mean ± SEM, n = 3) were determined. * P < 0.05 (standard t test).