Enables SH3 domain binding activity; acid phosphatase activity; and protein tyrosine phosphatase activity. Involved in chemical synaptic transmission. Located in neuron projection. Human ortholog(s) of this gene implicated in several diseases, including attention deficit hyperactivity disorder; conduct disorder; diabetes mellitus (multiple); diabetic retinopathy; and obesity. Orthologous to human ACP1 (acid phosphatase 1). [provided by Alliance of Genome Resources, Apr 2022]