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. 2020 Jan 21;10:3086. doi: 10.3389/fimmu.2019.03086

Figure 3.

Figure 3

ICOSL mutations identified at predicted interaction sites of homologous B7/CD28 family members. (A) Interaction of human CD80 with human CTLA4 as deduced from the crystal structure of CD80 extracellular domain dimer complexed with single extracellular domain of CTLA4 per CD80 monomer (PDB ID: 1I8L). (B) Homology model of human ICOSL extracellular domain based on CD80/CTLA4 complex. ICOSL residues predicted to be located within 5 angstroms of ICOS are colored cyan and marked by an asterisk. ICOSL residues frequently mutated through yeast library selection are colored purple and indicated in bold. Residues are split between front and back view of ICOSL dimer (rotated 180°) to maximize visibility in figure.