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Abundant expression of the PERIOD2::LUCIFERASE fusion protein (PER2::LUC) in the acinus of the submandibular gland (SMG) except for the ductal lumens. a, b Representative bright-field (a) and bioluminescence (b) images at the first trough (left), first peak (middle), and second trough (right) in the SMG of a PER2::LUC mouse. Scale bar 250 μm, pseudocolor bar relative intensity of PER2::LUC activity
