Estimated timescale of HIV-1 CRF07_BC, CRF08_BC and HCV 3a

aThe corresponding origin subtype of each genomic region are shown in the parenthesis.bThe genomic regions of CRF07_BC and CRF08_BC were located based on HXB2 genome. The genomic region HCV 3a was located based on H77 genome. The unit is nt (nucleotide).cThe 95% highest posterior density (HPD) credible regions are given in parentheses.dRates of evolution are expressed as 10−3 nucleotide substitutions per site per year. The 95% credible regions are given in the parentheses.