Figure 7.

The conditional density functions drawn at N₁ and C₁ residues, respectively. The horizontal axes represent the Cornette scale values while the vertical axes represent the density values. The density functions are estimated using the kernel approach using the R stats package with default parameter setting. The graph shows that the density functions drawn at N₁ demonstrate a larger separation between two classes while this difference is getting smaller for the residue C₁, which does not have a high rank value from RF models. Note that negative means unconfirmed sulfotyrosine whilst positive means experimentally verified sulfotyrosine.