Anti-APOL1 antibodies are used in the immunodetection of the protein apolipoprotein L1. In humans, the canonical protein has a reported length of 398 amino acid residues and a mass of 44 kDa. It is known to be a secreted protein. Alternative splicing is reported to yield 3 different isoforms for this protein. It is notably expressed in plasma. A member of a the Apolipoprotein L protein family, APOL1 is believed to play a role in lipid exchange and transport throughout the body. Post-translational modifications have been described, including phosphorylation and glycosylation. Synonyms for this target antigen include APOL, APOL-I, FSGS4, apolipoprotein L1-B3, and APO-L.