Human SH2 domain containing leukocyte protein-76-Associated Phosphoprotein of 130kD (SLAP-130), also known as Fyb-120 and ADAP, is an 86kD, 783 amino acid, cytoplasmic protein that runs anomalously as a 120-130kD protein in SDS-PAGE. Human SLAP-130 is a hematopoietic-specific adaptor that associates with other cytoplasmic proteins such as SH2-containing Leukocyte Phosphoprotein of 76kD (SLP-76). Adaptors integrate signals from surface receptors and are essential components of many immune cell-signaling cascades. There is at least one known alternatively spliced SLAP-130 isoform which contains an additional 46 aa. Over the region used as immunogen, SLAP-130 is 66% and 76% identical to the corresponding canine and mouse proteins, respectively.