Predicted to enable transmembrane signaling receptor activity. Involved in B cell differentiation and positive regulation of B cell receptor signaling pathway. Acts upstream of or within B cell receptor signaling pathway and regulation of B cell differentiation. Located in cell surface and membrane raft. Orthologous to human NFAM1 (NFAT activating protein with ITAM motif 1). [provided by Alliance of Genome Resources, Apr 2022]