Enables phosphate ion binding activity. Involved in negative regulation of sprouting angiogenesis and regulation of regulatory T cell differentiation. Predicted to be active in plasma membrane. Used to study hypertension. Human ortholog(s) of this gene implicated in essential thrombocythemia; familial erythrocytosis 1; and myelofibrosis. Orthologous to human SH2B3 (SH2B adaptor protein 3). [provided by Alliance of Genome Resources, Apr 2022]