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CpG site distribution, referred to gene map and transcript scheme in the HPV 1 genome. Genes are as follows: E6 = yellow, E7 = red, E1 = green, E2 = blue, E4 = fuchsia, E5 = pink, E5B = bright green, L2 = bluish green, and L1 = purple. Long control region and pre-genes = white.
