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The components of contextual fear conditioning differentially elevate c-fos mRNA in the hippocampus. Relative c-fos mRNA (±SEM) measured in the hippocampus is shown. Rats were killed 60 min after an immediate shock (IS), context exploration (C), context plus shock (C+S), or removal from the home cage (HC). *, #, Differs from home cage and immediate shock. Error bars represent SEM.
