Out of Africa (and Back?)

It was believed that only Homo sapiens from Asian and European stock carried Neanderthal genes, as a result of the former leaving Africa and interbreeding with Neanderthals they encountered in 'new' continents they arrived in. A recent study, from Princeton University in the USA, appears to show, however, that Africans do carry Neanderthal genes, albeit at a smaller percentage than Europeans (https://www.theguardian.com/science/2020/jan/30/neanderthal-genes-found-for-first-time-in-african-populations).The researchers point out that, although it has been thought for many years that our species originated in Africa, before migrating out, there have been relatively few detailed studies on the genes of human populations on that continent. The results strongly suggest that some individuals who migrated out and interbred with Neanderthals, had progeny who migrated back to Africa (carrying some Neanderthal genes with them). It remains to be determined whether some of the more ancient African lineages, such as the bushmen, have Neanderthal genes