(University of Tokyo) Researchers at the University of Tokyo conducted a census of the Japanese population around 2,500 years ago using the Y chromosomes of men living on the main islands of modern-day Japan. This is the first time analysis of modern genomes has estimated the size of an ancient human population before they were met by a separate ancient population.
from EurekAlert! - Archaeology http://bit.ly/2x7rvyO
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