Low-power (A) and high-power (B) photomicrographs of ectopic-labeled cells in dorsal thalamus of knock-out animals after implantation of DiI in the sensorimotor cortex. C, For comparison, retrogradely labeled neurons in the same thalamic region after placement of DiI in the cingulate cortex of normal animals. The dashed line indicates the border between hippocampus and dorsal thalamus. See Figure 1. Scale bars: A, 100 μm;B, C, 50 μm.