Is predicted to encode a protein with the following domains: Growth factor receptor domain 4; Receptor L-domain superfamily; Furin-like cysteine-rich domain; Growth factor receptor cysteine-rich domain superfamily; Furin-like cysteine rich region; Growth factor receptor domain IV; Receptor L-domain; Furin-like repeat; and Receptor L domain. Is an ortholog of C. elegans let-23. In C. elegans, let-23 is involved in several processes, including determination of adult lifespan; positive regulation of vulval development; and reproductive structure development.