gp120 ligation of CD4 induces p56lck activation and TCR desensitization independent of TCR tyrosine phosphorylation.
Goldman F, Jensen WA, Johnson GL, Heasley L, Cambier JC. gp120 ligation of CD4 induces p56lck activation and TCR desensitization independent of TCR tyrosine phosphorylation. J Immunol. 1994 Oct 01; 153(7):2905-17.