A fascinating article in PLoS Biology talks about the origin of the Mlabri, "an enigmatic hunter-gatherer group from northern Thailand". These people have no diversity in their mitochondrial DNA and very reduced diversity elsewhere in their genomes. The evidence points to a recent origin, perhaps 500 to 800 years ago, from a group that was previously agricultural. Thus it seems that the road from hunter-gatherer to farmer is not always one-way.
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