Mouse APS Synthetic Peptide. APS (adapter protein with Pleckstrin homology and Src homology 2 domains) a member of the Lnk family, is an adaptor protein that is involved in B-cell signaling, insulin signaling, cytoskeletal reorganization. It is tyrosine phosphorylated by JAK2, KIT and other kinases during B-cell receptor stimulation of many different cytokines, chemokines and leukokines. APS has been shown to inhibit the JAK-STAT pathway in collaboration with c-Cbl. It is located in the cytoplasm in pre-PDGF (platelet derived growth factor) stimulated cells and localizes to the plasma membrane and peripheral regions upon PDGF stimulation. This protein is expressed in B-cells and mast cells when detected in haematopoietic cell lines yet is a