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Comparison of total numbers (NeuN+) neuron in hippocampus CA1 region for TG and WT rats on a normal or vitamin A deficient diet and treated with either placebo or morphine (WTND = wild type rat, normal diet; WTVA = wild type rat, vitamin A deficient diet; TGND = transgenic rat, normal diet; TGTVA = transgenic, vitamin A deficient diet). Cell numbers were higher for WTND rats than for both WTVA rat groups and for TGND placebo treated rats and for TGVA rats treated with morphine.
