Predicted to enable receptor tyrosine kinase binding activity. Acts upstream of or within several processes, including embryo implantation; mammary duct terminal end bud growth; and positive regulation of mammary gland epithelial cell proliferation. Located in vacuole. Is expressed in esophagus epithelium; liver; liver parenchyma; pharynx epithelium; and stomach proventricular region epithelium. Orthologous to several human genes including MST1 (macrophage stimulating 1). [provided by Alliance of Genome Resources, Apr 2022]