Diversity of the PPG contents among inbred mice

The dynamics of PPG content in evolutionary history of C57BL/6 mice demonstrates a relatively high rate of new PPG acquisitions during the most recent times suggesting high activity of retrobiome in this laboratory strain. To check this possibility, we conducted WGS for 5 individual C57BL/6 males originating from Charles River colony and analyzed the presence of novel PPGs to evaluate the process of acquisition of new PPG copies continuing in current populations of C57BL/6 mice.