Ligation of inhibitory LILR results in phosphorylation of their ITIM domains and recruitment of p56lckand SHP-1. This causes dephosphorylation of the ITAMS that would, in the absence of the inhibitory signals, drive cell activation. HLA-G interacts with inhibitory LILR. Modified from Brown et al.(66). ITAMS, immunoreceptor tyrosine-based activating motifs; ITIM, immunoreceptor tyrosine-based inhibitory motif; SHP-1, SH2-containing protein-tyrosine-phosphatase-1.