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Expression of p16 in HMEC9. (A) Western analysis of p16 and p27. (B) Northern analysis of p16 with 36B4 loading control. Passage numbers are indicated above each lane. Cells were predominantly arrested at M0 by passage 8. A stable population of proliferating cells emerged by passage 14. UN, uninfected. E6 or E6/E7, infected with E6- or E6/E7-expressing retrovirus.
