PILRa, a Novel Immunoreceptor Tyrosine-based Inhibitory Motif-bearing Protein, Recruits SHP-1 upon Tyrosine Phosphorylation and Is Paired with the Truncated Counterpart PILRb 和 FDF03, a Novel Inhibitory Receptor of the Immunoglobulin Superfamily, Is Expressed by Human Dendritic and Myeloid C ...