Expression of L1lacZ (A and B) and L1lacZΔN (C and D) in sagittal sections of the adult (30 week old) mouse brain (A and C). (B and D) Higher magnification views of expression of the two transgenes in the hippocampus. CB, cerebellum; CTX, cortex; HC, hippocampus; IC, inferior colliculus; M, medulla; OB, olfactory bulb; P, pons; SC, superior colliculus; STR, striatum; THAL, thalamus.