title: When two worlds collide.
authors.affiliation: Laboratory of Biological Anthropology, University of Kansas, Lawrence 66045.
authors.forename: M H
authors.initials: MH
authors.lastname: Crawford
mesh_terms: D004641:Emigration and Immigration; D005060:Europe / Q000208:ethnology; D014644:Genetic Variation; D006801:Humans; D007198:Indians, North American / Q000235:genetics; D007199:Indians, South American / Q000235:genetics