Figure 4.

Surface representation of PD-1 binding interfaces: (A) with PD-L1: orange and yellow represent key hydrophilic and hydrophobic residues, respectively. (B) with pembrolizumab: blue and light green represent key hydrophilic and hydrophobic residues respectively. (C) with nivolumab: magenta and light pink represent key hydrophilic and hydrophobic residues respectively.