passages.id: split_1_test_209_passage
passages.type: progene_text
passages.text: We have previously shown that a 66 - bp purine - thymidine - rich sequence ( the 66-mer ) binds CDP and negatively regulates the human papillomavirus type 6 ( HPV-6 ) E6 promoter ( S. Pattison , D. G. Skalnik , and A. Roman , J. Virol. 71 : 2013 - 2022 , 1997 ) .