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Representative film autoradiographs showing the effect of repeated social stress on MOR mRNA expression in the VTA of handled control and stressed rats 3 and 14 days after the last exposure. Handled control rat (A) 3 and (B) 14 days after handling; stressed rat (C) 3 and (D) 14 days after the last stress exposure. Note increased MOR mRNA expression after social defeat stress. SNc – substantia nigra, pars compacta; SNr - substantia nigra, pars reticulata.
