a generalized least-squares method was applied in fitting a model to mtdna sequence data , and the clock gave dates of 92.3 +/- 11.7 , 13.3 +/- 1.5 , 10.9 +/- 1.2 , 3.7 +/- 0.6 , and 2.7 +/- 0.6 million years ago ( where the second of each pair of numbers is the standard deviation ) for the separation of mouse , gibbon , orangutan , gorilla , and chimpanzee , respectively , from the line leading to humans .
C1413503
clock
C0086418
humans