A conserved CXXC motif in CD3epsilon is critical for T cell development and TCR signaling.
Wang Y, Becker D, Vass T, White J, Marrack P, Kappler JW. A conserved CXXC motif in CD3epsilon is critical for T cell development and TCR signaling. PLoS Biol. 2009 Dec; 7(12):e1000253.