 In particular, they cite the spread of farming from a source population in West Asia 5000–9000 years ago that may have played a role in the genetic relatedness of Africans and Europeans, since West Asia is sandwiched in between Africa and Central Asia.The model assumed an out of Africa migration 100kya and a single admixture event 30kya.However, most contemporary studies have more recent dates that place the out of Africa migration 50–70kya.