Fig 3. Mass-standardised whole-body RNA:protein ratios plotted against temperature. All values were standardised to a mean body mass of 129 g, the mean body mass of all the animals in the data set, using a scaling coefficient of -0.24. The scaling coefficient was calculated by fitting a least-squares regression model to the natural-log-transformed body mass and RNA:protein ratio data for all species. The regression line relating temperature and RNA:protein ratio was fitted by least-squares regression analysis (y=10.4-0.274x, r²=0.20, P<0.05) to all data with the exception of points labeled 14 (rat). For sources of plotted data, see Table 2.