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Age of HML-2 LTRs. LTRs from 5Hs, 5A, and 5B subgroups were used to determine distance measurements as a function of time of integration. Ages of "Solo LTR" elements were determined as described in Methods, while "Provirus" element ages were determined by 5' to 3' distance measurement. "Human Specific 5Hs" refers to solo LTRs that are only found in the human genome, and whose age was calculated using the solo LTR age calculation method.
