Enables phosphatidylserine binding activity. Acts upstream of or within apoptotic cell clearance. Predicted to be located in membrane. Predicted to be integral component of membrane. Is expressed in brain; dorsal aorta; liver; lung; and reproductive system. Used to study systemic lupus erythematosus. Orthologous to human TIMD4 (T cell immunoglobulin and mucin domain containing 4). [provided by Alliance of Genome Resources, Apr 2022]