Signal regulatory proteins (SIRP-alpha, -beta, and -gamma) are important regulators of several innate immune functions that include leukocyte migration. Membrane distal (D1) domains of SIRPalpha and SIRPgamma, but not SIRPbeta, mediate binding to a cellular ligand termed CD47. Because the extracellular domains of all SIRPs are highly homologous, we… (More)
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