Residue 204DENV1/209ZIKV is located distally from the structural ZIKV-116 epitope. Two representative asymmetric units of the mature ZIKV virion (PDB 6CO8) are shown as ribbon structures (DI, red; DII, yellow; DIII, blue; transmembrane domain, white). The icosahedral symmetry axes are indicated by a purple oval (twofold), triangle (threefold), and pentagon (fivefold). Red spheres mark residue R/K204(DENV1)/K209(ZIKV), and magenta spheres mark residue E393. The distance between the Cα of two residues are measured using PyMOL software. E393 is ∼60 Å away from residue R/K204(DENV1) on the E monomer, and the closest distance of E393 to R/K204(DENV1) from adjacent E monomer is ∼30 Å.