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Nicotine administration prior to one of the three days that comprise the CPFE. A) Nicotine administered prior to pre-exposure only had no effect on the CPFE (n = 9). B) Nicotine administered prior to immediate shock only had no effect on the CPFE (n = 8). C) Nicotine administered prior to testing only had no effect on the CPFE (n = 10). PE – Pre-exposed, NPE –Not pre-exposed, IS – Immediate shock. Error bars represent SEM.
