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