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Updates and Corrections

In the printed version of the supplement, please make this correction to page 143, Step 7, line 4, and to page 146, Step 3, line 4, of the equations: " = 1.13 x 10-10 changes per nucleotide per year" should be " = 1.3 x 10-10 changes per nucleotide per year".

On page 146, Step 3, first equation: Should be "4 changes/30 nucleotides", not "4 changes/35 years".

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