Antibodies directed against HLA-DR gene products exhibit the CYNAP phenomenon*

Abstract
Two well characterized Eighth International Workshop [human] sera, 8w1090 and 8w112, described to have anti-DR3 and anti-DR5 activity, respectively, were tested by standard and antiglobin augmented (AHG) complement dependent cytotoxicity (CDC) assays with 21 target cells. Both sera have only 1 antibody (most likely anti-MT2), but have different cytotoxicity negative absorption positive patterns. These observations are discussed with regard to a more complete analysis of antisera that detect gene products of the HLA-DR region.