- Cutting edge: the HLA-A*0101-restricted HY minor histocompatibility antigen originates from DFFRY and contains a cysteinylated cysteine residue as identified by a novel mass spectrometric technique. Pierce, R.A., Field, E.D., den Haan, J.M., Caldwell, J.A., White, F.M., Marto, J.A., Wang, W., Frost, L.M., Blokland, E., Reinhardus, C., Shabanowitz, J., Hunt, D.F., Goulmy, E., Engelhard, V.H. J. Immunol. (1999)