sentences:  However, NBS1 mediated MMEJ repair is highly inaccurate, so in this case, over-expression, rather than under-expression, apparently leads to cancer.HSV-1 infects more than 90% of adults over the age of 50.Alphaherpesviruses alone can cause the host to have mild symptoms, but these viruses can be associated with severe disease when they are transferred to a new species.