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Fos staining in the piriform cortex. Sections were stained for Fos immunohistochemistry 45 min after an intramuscular injection of soman 10 d after unilateral injections of vehicle, saline ipsilaterally in the NDB. A, Fos staining in PC ipsilateral to the saline-injected NDB. B, Fos staining in the contralateral control PC. Scale bar, 750 μm. I, II, III, Layers of PC; LOT, lateral olfactory tract.
