Genome Res 21:1223-38. PMID: 21734011. About the Author Ray Lambert is the technical writer for JAX® Mice &amp, Services at The Jackson Laboratory. J:DO mice are available from The Jackson ...

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By 12 months of age, the mutant frequency at the Hprt locus in Xpc−/− animals increased to a level of 26×10 −6 while the frequency in Xpa - and Csb -defective mice remained at background ...

According to research from 2011, walking speed decreases slightly each year as you age. This averages out to a difference of 1.2 minutes slower for every kilometer (.62 mile) at age 60 than at age 20.