A review of Denisovan DNA in modern humans

https://www.sciencedaily.com/releases/2024/11/241108113302.htm
https://www.nature.com/articles/s41588-024-01960-y
The Nature article is paywalled.
Unlike the Neanderthal interbreeding that may have been a single event that resulted in the Neanderthal DNA that modern human populations have there is pretty good evidence that multiple interbreeding events in different parts of the world occurred between modern humans and Denisovans.  They identify 4 distinct populations of Denisovans that may have interbred with modern humans.  The overhype of the Science Daily article includes South America as a possible place where Denisovans may have existed, but the evidence for this in the review article was minimal.  They could have made it over to America, but didn't leave much evidence of their existence.  Denisovans probably lived through around 5 ice ages in Asia.  So there were likely as many chances to get over to America as there was to get to the Philippines and New Guinea.  The review claims that better analytical methods need to be developed to figure out where the Denisovan DNA came from in South America.  The Denisovans interbred with Asians multiple times, and there is even the possibility that the bits of genome came over with genomes coming in after the European colonization.
Ron Okimoto