Figure 3From: Altered expression of circadian clock gene, mPer1, in mouse brain and kidney under morphine dependence and withdrawal Immunohistochemical stain for determining mPER1 protein expression in brains and kidneys. a: Positive staining in the nucleus and cytoplasm are found in brains of Con, MD and MW mice. b: Representative cases show positive staining for mPER1 in kidneys of Con, MD and MW mice. Original magnification: 200× for all cases.Back to article page