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Effect of the NMDA receptor antagonist MK-801 (MK) administered 1 hr before re-exposure to the original context and the test trial given immediately after re-exposure. Left, Behavioral protocols. Allsymbols and the protocol are as described in Figure4A, except for the test trial (Ts) given immediately after re-exposure on day 2. Right, Test trial on day 3. Symbols are as described in Figure1A. Asterisks are as in Figure1.
