Anti-CD93 antibodies are used in the immunodetection of the protein CD93 molecule. In humans, the canonical protein has a reported length of 652 amino acid residues and a mass of 68.6 kDa. Its subcellular localization is in the membrane. It is reported to be highly expressed in endothelial cells, platelets, cells of myeloid origin, such as monocytes and neutrophils. CD93 is a known receptor (or element of a larger receptor complex) for C1q, mannose-binding lectin (MBL2) and pulmonary surfactant protein A (SPA). Post-translational modifications have been described, including O-glycosylation. CD93 is also used as a cellular marker for characterizing hematopoietic stem cells. Synonyms for this target antigen include C1qR(P), C1qRP, CDw93, ECSM3, MXRA4, dJ737E23.1, complement component C1q receptor, and C1QR1. CD93 gene orthologs have been reported in the mouse, rat, bovine, frog, chimpanzee and chicken species.