We are all mutants

Measurement of mutation rate in humans by direct sequencing

http://www.eurekalert.org/pub_releases/2009-08/wtsi-waa082509.php


"Remarkably, the new research, published today in Current Biology, shows that these early estimates were spot on - in total, we all carry 100-200 new mutations in our DNA. This is equivalent to one mutation in each 15 to 30 million nucleotides. Fortunately, most of these are harmless and have no apparent effect on our health or appearance."