No. That's not quite what I'm saying. There was no particularly interesting effect of inducing transient expression of the Yamanaka factors on normal mice rep

No. That's not quite what I'm saying. There was no particularly interesting effect of inducing transient expression of the Yamanaka factors on normal mice reported in this paper. It is effectively a negative result that's being reported, as it pertains to wild-type mice. The paper primarily reports results that pertain to mice with a genetic defect that causes progeria. Mice with this defect have a shorter-than-normal lifespan.