Newborn GCs of injected rats, both with retrovirus and PBS, but not of control rats express GAD in their somata, while all express GAD67 in their mossy fibers. A) GFP+ cell co-expressing DCX and GAD67. B) Developing cells in non-injected adult rats, detected by their expression of doublecortin (DCX), did not express GAD67. C) Some developing cells, detected by their expression of PSA-NCAM, expressed GAD67 in PBS injected rats. D) In control, non injected rats, a number of PSA-NCAM+ mossy fibers expressed GAD67.