There it remains, unless a rare mutation opens a path to a new, higher fitness peak.

In fact, recent research has found that people with schizophrenia tend to have higher rates of rare genetic mutations.

A11 Italian town boasts of a rare mutation that fights heart disease.

This is a rare mutation from the ancestral value of 12.

A rare mutation or an unusual gene diversion- the results are all that matter.

The genes of the original and its copy will be the same, except for rare mutations.

"The actual situation proved to be not unlike your own: a rare and random mutation."

Later, a test showed that she carried a rare mutation not picked up by the standard test.

A rare mutation has occurred within the vampire community.

The woman carried a rare genetic mutation that made her almost certain to develop Alzheimer's disease before age 40.