614 microsatellite positions. She created an evolutionary tree to
help explain the genetic variation in the microsatellites. It turned out
that the best way to explain this variation was the occurrence of two
periods of interbreeding between humans and an archaic species, such
as Homo neanderthalensis or Homo heidelbergensis.
Using estimated rates of genetic mutation and data from the fossil
record, the researchers think that the periods of interbreeding may have
occurred around 60,000 years ago in the eastern Mediterranean and around
45,000 years ago in eastern Asia, both after the first migration of Homo
sapiens out of Africa. That would explain why Long and his team did not find
evidence of interbreeding in the modern Africans that were included in the
study." Source
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