VIP-positive cells in the SCN of CBA/J and CBA/N mice. A. Coronal SCN sections stained with an antibody against VIP show that in both CBA/J and CBA/N mice, VIP-positive cells bodies are found primarily in the ventral SCN, with fibers projecting dorsally. B. Magnified area indicating the ability to count cell bodies stained for VIP. Scale bar = 20 μm. C. The average number of VIP-positive cells detected per SCN is greater in the SCN of CBA/J mice compared to CBA/N. Scale bar = 100 μm. * = p = 0.04, t10 = -2.4.