Predicted to enable IgM binding activity and transmembrane signaling receptor activity. Predicted to act upstream of or within immunoglobulin transcytosis in epithelial cells. Predicted to be located in apical plasma membrane and basolateral plasma membrane. Predicted to be active in plasma membrane. Orthologous to human CD300LG (CD300 molecule like family member g). [provided by Alliance of Genome Resources, Apr 2022]