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Spatiotemporal changes in SHH expression in the human cerebral cortex between 15 and 40 (newborn) gw. a–f Low magnification of the cortical column at the indicated age. a″–f′ High magnification of cells in the subplate (SP)/intermediate zone (IZ) area (indicated boxes). a‴–e″ High magnification of cells in the cortical VZ (except at 40 gw,when there is no VZ). CP cortical plate. Scale bars : f 200 µm, f′ 50 µm
