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Fear conditioning induces Shh/BrdU/NeuN-positive cells in the basolateral amygdala (BLA). (A) Mice were intraperitoneally injected with BrdU (300mg/kg) 2h before fear conditioning and BrdU+/Shh+/NeuN+ cells were analyzed 42 days after training. (B) GFAP+/Shh+/DAPI+ cells were analyzed 3 days after training. BrdU, 5-bromo-2’-deoxyuridine; GFAP, Glial fibrillary acidic protein; Shh, sonic hedgehog.
