Alterations in CD4-binding regions of the MHC class II molecule I-Ek do not impede CD4+ T cell development.
Yelon D, Schaefer KL, Berg LJ. Alterations in CD4-binding regions of the MHC class II molecule I-Ek do not impede CD4+ T cell development. J Immunol. 1999 Feb 01; 162(3):1348-58.