In a review of recently published scientific studies, investigators at Keck School of Medicine of USC identified a natural barrier to the inner’s sensory cells’ ability to regenerate.

Thousand Oaks, California-based Amgen is acquiring Seattle-based Rodeo Therapeutics, which develops small-molecule drugs that promote regeneration and repair of various tissues.

A recent study published in Nature suggests there exists a biological barrier on human life expectancy that effectively can not be broken.