- PA28alphabeta double and PA28beta single transfectant mouse B8 cell lines reveal enhanced presentation of a mouse cytomegalovirus (MCMV) pp89 MHC class I epitope. Stohwasser, R., Soza, A., Eggers, M., Koszinowski, U.H., Kloetzel, P.M. Mol. Immunol. (2000)