Northern analysis of RB3 mRNA expression in the rat. a, A rat multiple-tissue Northern blot showing the expression of RB3 mRNA in the heart, brain, spleen, lung, liver, skeletal muscle, kidney, and testis. b, Northern blot showing the expression of RB3 mRNA in different regions of the human brain: amygdala, caudate nucleus, corpus callosum, hippocampus, total brain, substantia nigra, subthalamic nucleus, and thalamus.c, Northern blot showing the expression of RB3 mRNA in the rat brain at E12, E16, E18, and P1, in the adult brain, and in the hippocampus of control and MECS-stimulated brains.