Infinite sites mutation model
= Infinite sites mutation model
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= Infinitely many sites mutation model
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The infinite-sites model assumes that every mutation occurs at a previously unmutated site, so each mutation on the sample genealogy produces a distinct segregating site. If mutation rate per lineage is $\theta/2$ in standard coalescent time units, a tree of total length $L$ has a <Poisson distribution> of mutation count with mean $\theta L/2$.