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The effect of s.c. formalin or saline 1 h after pre-exposures to the to-be-conditioned context on the ability of context pre-exposure to reduce the immediate shock deficit when conditioning occurs the following day. Pre-exp refers to rats that had a session of five 2-min exposures to the context on the day prior to conditioning. HC refers to rats that received equivalent handling in their homecages on the day prior to conditioning.
