Is predicted to encode a protein with the following domains: Saposin B type domain; Saposin B type, region 2; Saposin-like type B, region 2; and Saposin-like. Is an ortholog of C. elegans spp-5. In C. elegans, spp-5 is involved in defense response to Gram-negative bacterium and defense response to Gram-positive bacterium.