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Mean (±s.e.m.) levels of conditioned stimulus (CS)-elicited freezing in maternally-separated (MS; white bars) and standard-reared (SR; black bars) rats tested either 1 or 10 days post-fear conditioning. High and similar levels of fear are present in the MS (n=12) and SR (n=15) rats at the 1-day interval. However, at 10 days post-training, MS (n=11) rats exhibited much higher levels of freezing than SR (n=9) rats.
