Here are recombinant proteins for SIT1, the approved symbol for the human gene, 'signaling threshold regulating transmembrane adaptor 1'. With a Uniprot ID of Q9Y3P8, this protein is listed as having 196 residues in length and a mass of 21.2 kDa. The following protein function has been assigned: 'Negatively regulates TCR (T-cell antigen receptor)-mediated signaling in T-cells.' A subcellular localization as 'cell membrane' is noted. Orthologs are reported in these species: mouse, rat. SIT1 may also be known by other designations: 'signaling threshold-regulating transmembrane adapter 1, SHP-2 interacting transmembrane adaptor protein, SHP2 interacting transmembrane adaptor, SHP2-interacting transmembrane adapter protein, SHP2-interacting transmembrane adaptor protein, gp30/40, suppression inducing transmembrane adaptor 1, suppression-inducing transmembrane adapter 1'.