Fig. 3.

a Hippocampus of a mouse carrying the Reln ^orl reelin mutation. b Two distinct cell layers and deep cell clusters in the septal mid-proximodistal CA1 of a Reln ^orl mouse. c At more temporal levels packing densities and cell sizes in the two CA1 layers resemble those in normal laboratory mice. d CA1 pyramidal cells in Reln ^orl mouse retain their neurochemical identity with regard to calbindin, with only the younger, now deep pyramids showing moderate calbindin immunoreactivity. e The two CA1 layers of Reln ^orl mice do not show appreciable differences in their parvalbumin immunoreactivity. f Zbtb20 (green) in C57Bl/6 mouse superficial pyramidal cells and Sox5 (red) in deep pyramidal cells. g Scattered deep pyramidal cells in distal CA3 of the Chincilla do not receive mossy fiber input close to their soma. h Scattered deep pyramidal cells in distal CA3 of the fox. Scalebars a 0.5 mm, b–h 50 μm. The original of f was kindly provided by Prof. Niels A. Jensen (Nielsen et al. 2010, with permission of Oxford University Press)