Influence of Pctp expression and ambient temperature on core body temperatures of mice. Core body temperature was measured for wild-type (closed circles) and Pctp−/− (open circles) mice maintained at 30°C (A; wild type, n = 5; Pctp−/−, n = 5), 23°C (B; wild-type, n = 7; Pctp−/−, n = 11), and 4°C (C; wild type, n = 6; Pctp−/−, n = 9). Where not visible, error bars are contained within symbol sizes. *P < 0.05, Pctp−/− versus wild type; **P < 0.006, Pctp−/− versus wild-type.