HPV strains that cause cervical cancer produce protein E7, which:
a. causes the degradation of pRb
b. frees up the transcription factor E2F to express the oncogene
c. ADP ribosylates protein synthesis factor EF2
d. activates G proteins
e. down-regulates MHC proteins on the cell surface
Answer: frees up the transcription factor E2F to express the oncogene
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