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Mean percent conditioned responding during 10 days of Acquisition and 10 days of tone-alone Extinction separated by 8 weeks on a specific diet. The 6CP2, 2PC6, 4C4P, 4P4C, and 0C8P group designations refer to the number of weeks out of eight the rabbits were on either a 2% cholesterol diet (C) or on normal Purina rabbit chow (P). The order of the letters and refers to order in which rabbits received their respective diets. *P < .05, **P < .01.
