CD274 and cytomegalovirus infection: Influence of HCMV infection on the phosphorylation of MAPK in HPT-8 cells: In order to determine possible mechanisms of HCMV induced B7-H1 expression in HPT-8 cells, we did Western-Blot to check the phosphorylation of MAPKs that could involved in the expression of B7-H1 mRNA.