The Tec kinases are required for full Ca2+ mobilization in lymphocytes. Rec
ent data suggest that this process occurs via a multiprotein complex that i
ncludes LAT and SLP-76 in T cells and BLNK/SLP-65 in B cells. Mutational an
alyses have revealed critical roles for Tec kinases in lymphocyte developme
nt and function.