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Yohimbine facilitates extinction of cue and context fear acutely. CS-elicited freezing during the Day 2 extinction sessions from all of the experiments shown in Figures 1 and 2, 20 min after injection of vehicle, yohimbine, or propranolol (27-32 mice/group). Because mice were treated identically up to the fifth CS of the cue fear experiments (A) and the tenth minute of exposure in the context fear experiments (B), the data were combined for this analysis.
