Movable sequences of DNA are more common TPT

Link: 29 June 2010

...retrotransposons: DNA sequences which can 'copy and paste' their genetic code around the genome.
...

"This tells us that active human retrotransposons are much more common than we expected. Individual active L1 retrotransposons are quite rare - but there are a lot of them."

Original study in Cell.

FTA: Therefore, these results suggest that hot L1s are more abundant in the human population than previously appreciated, and that ongoing L1 retrotransposition continues to be a major source of interindividual genetic variation.

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Another impetus to rethink 'genetic clocks'

p.s. after reading this link I'd say 'Molecular clock dating is even more uncertain TPT'.