CCNB1 and infection: Using a densitometric quantitation of Wb signals from HCMV-infected HFF samples (with mean values derived from four independent experiments harvested at four, five or six days post-infection), the high-affinity interaction of cyclin H with pUL97 was illustrated (Table 2; 160% signal intensity for cyclin H compared to 100% for cyclin B1, taken as the reference, and a reduced level of 77% for cyclin T1).