Carbonyl protein levels in frontal cortex, liver and BAT. In frontal cortex, carbonyl protein levels are significantly lower during hibernation. Horizontal bar indicates significant difference between groups (p<0.01, SNK, n=6 hAGS, n=5 eAGS). Rat data is described below, for comparison with a familiar species, but not shown to avoid over-interpretation of cross-species comparisons. Levels of CP in frontal cortex of rat were 797±132 nmol/g wet mass (p<0.05, SNK compared to hAGS, n=4 rats). Levels of CP in BAT from rat were 107±29 nmol/g wet mass (p<0.01, SNK compared to eAGS, n=4 rats).