Is predicted to encode a protein with the following domains: Kelch-type beta propeller; Spermadhesin, CUB domain superfamily; Kelch motif; Laminin-type EGF domain; Kelch repeat type 1; EGF-like domain; CUB domain; Laminin EGF domain; PSI domain; and Plexin repeat. Is an ortholog of C. elegans atrn-1.