Is predicted to encode a protein with the following domains: Cysteine rich repeat, tripleX and Cysteine rich repeat. Is an ortholog of C. elegans
appg-2 and members of the C. elegans abu and pqn gene classes including
abu-5 and
pqn-78. In C. elegans,
abu-4 is involved in endoplasmic reticulum unfolded protein response.