TABLE 1.

Percentage of S-phase NIH 3T3 cells expressing p16^INK4a alone or in combination with E7 proteins^a

Expt	pBabe-puro p16INK4a
	pBabe-neo	HPV1 E7	HPV16 E7	HPV16 PP-E7	HPV16-1-16 E7	HPV1-16-1 E7
1	4.38	5.48	12.31	7.06	5.79	12.10
2	7.63	8.50	13.10	8.90	8.80	11.80
3	7.21	7.10	12.20	NDb	ND	11.00

^aFor flow cytometry, the different cell populations were prepared as described in the legend to Fig. 7. 

^bND, not determined.