Fig. 4. Morphology of MGE-derived neurons stained for alkaline phosphatase. (A,D,E,H) Neurons in 4-month-old animal; (B,C,F,G,I) neurons in 3-week-old animal; dorsal is towards the top throughout. MGE cells in the neocortex differentiated into: aspiny multipolar neurons (A,C), bi-tufted neurons (B), neurons with a small cell body (D, arrow), basket cells (E) and chandelier cells (F). MGE cells were also observed in: the CA1 field of the hippocampus (basket cells) (G), the lateral globus pallidus (H) and the striatum (I). To capture some of the fine three dimensional processes, two to three photographs taken in different focal planes were fused to produce the final image.