Properties of channels in different enzymatic classes. The topmost panel shows the variability of average channel length in individual enzymatic classes in comparison with the overall average channel length. The middle panel shows the average channel polarity for each enzyme class as well as the polarity of individual parts of the channels. The colors of the bars correspond to different parts of the channels, as shown in the key at the bottom. The bottom panel shows the variability in average hydropathy. Error bars show the standard error of the mean.