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Effect of CCK-8 on intakes of chow in 30-min tests after 18-h food deprivation. Intakes are expressed as mean % intake after injection of vehicle. Error bars are not shown for clarity, but standard error averages about 10% of the mean. Left: data from young adult (Y: 3–4 mo) and middle-aged (M: 7–8 mo) MC3R−/− and MC3R+/+ mice. Right: data from Y and M (10–11 mo) MC4R−/− and Y MC4R+/+ mice. The numbers of mice per group were 4–10, as shown in Table 3.
