Estimates of π (Nei and Li 1979) and θ (Watterson 1975) are per silent/synonymous site. The numbers in each cell refer to estimates from siII/siIII/per. Using coalescent simulations, Tajima's D was significantly negative for per sampled from Mwanza, Dar es Salaam, and Nairobi (indicated by underlining), and all Fu's F's were significantly negative for per at the 2% level, which corresponds to a 5% rejection rate (Fu 1997). NA, not applicable (the mtDNA haplogroup either does not occur at that locality or contains no polymorphism).