Is predicted to encode a protein with the following domains: Major sperm protein (MSP) domain; MSP (Major sperm protein) domain; PapD-like superfamily; and Immunoglobulin-like fold. Is an ortholog of C. elegans
lin-18 and members of the C. elegans ssp gene class including
ssp-31. In C. elegans,
lin-18 is involved in several processes, including asymmetric protein localization involved in cell fate determination; axis specification; and positive regulation of axon guidance.