Anti-PEBP4 antibodies are used in the immunodetection of the protein phosphatidylethanolamine binding protein 4. In humans, the canonical protein has a reported length of 227 amino acid residues and a mass of 25.7 kDa. It is known to be a secreted protein. A member of a the Phosphatidylethanolamine-binding protein family, PEBP4 is reported to promote AKT phosphorylation, suggesting a possible role in the PI3K-AKT signaling pathway. Post-translational modifications have been described, including glycosylation. Synonyms for this target antigen include epididymis secretory protein Li 300, epididymis secretory sperm binding protein, protein cousin-of-RKIP 1, and cousin-of-RKIP 1 protein.