The function of LAT2 (linker for activation of T cells family member 2, Ensembl gene identifier ENSG00000086730) is as follows. Involved in FCER1 (high affinity immunoglobulin epsilon receptor)-mediated signaling in mast cells. May also be involved in BCR (B-cell antigen receptor)-mediated signaling in B-cells and FCGR1 (high affinity immunoglobulin gamma Fc receptor I)-mediated signaling in myeloid cells. Couples activation of these receptors and their associated kinases with distal intracellular events through the recruitment of GRB2. {ECO:0000269|PubMed:12486104, ECO:0000269|PubMed:12514734, ECO:0000269|PubMed:15010370}.