unirradiated and gamma-irradiated fibroblasts were infected with unirradiated or irradiated ad2 , either immediately or at different times after cell monolayer irradiation , and at 48 h after infection cultures were examined by indirect immunofluorescence to determine the number of cells in which ad2 viral structural antigen ( vag ) was expressed .
C0016030
fibroblasts
C0007634
cell