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Whole mounts of fetal cerebrum at (A) 18 and (B) 25 gestational weeks stained with neurofilament to demonstrate axons and vimentin to demonstrate cell processes and radial glia. By 25 gestational weeks, the deep subplate merged with the intermediate zone with an increase in cell processes in both the subplate layer and intermediate zone. Neurofilament stain shows increased fibers (reddish brown) within the intermediate zone.
