In silico 3D modeling of potential pairings of IgE heavy chains featuring KiH mutations.A, αEGFR T121G homodimer. B, αEGFR T121G x αPSMA S10I heterodimer. C, αPSMA S10I homodimer. Two heavy chains in gray and cyan; S10I in magenta, T121G in yellow. The dashed lines indicate the distance measurements in angstrom (Å). KiH, knobs-into-holes; PSMA, prostate-specific membrane antigen.