Distinct, syncytin-like genes have been identified in primates, rodents, lagomorphs, carnivores, and ungulates, with integration dates ranging from 10 to 85 million years ago.
Identificáronse diferentes xenes de tipo sincitina nos primates, roedores, lagomorfos, carnívoros, e ungulados, con datas de integradión que van desde hai 10 a 85 millóns de anos.