Figure 4. Expression of clock-related genes in the submandibular glands in Cry1–/– and Cry1–/–Cry2–/– mice. Cry1–/– and Cry1–/–Cry2–/– 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).