Is predicted to encode a protein with the following domains: Major sperm protein (MSP) domain; Immunoglobulin-like fold; PapD-like superfamily; and MSP (Major sperm protein) domain. Is an ortholog of C. elegans
lin-18 and members of the C. elegans ssp gene class including
ssp-35. 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.