Figure 2. Correlation of reduction potential and physicochemical properties: Groups of physicochemical properties of metalloenzymes that can be measured from protein structure are shown along the x-axis. Each circle is the absolute value of the Pearson correlation coefficient for reduction potentials. Colored circles represent p-value ≤ 0.05 for the correlation and empty circles represent p-value ≥ 0.05. Horizontal box lines, from top to bottom, represent the upper quartile, median, and lower quartile correlation values for the respective property category. The whiskers display the range of correlation values for the respective property category, except for outliers, which are greater than 150% of the interquartile range from the box.