Iasi et al. 2024. Neanderthal ancestry through time: Insights from genomes of ancient and present-day humans. Science 386(6827)
“… identified Neanderthal ancestry in genomic data … found that gene flow likely happened over a period of about 6000 years, and that positive and negative selection acted within about 100 generations … didn’t find evidence for a second pulse of introgression into East Eurasians ...”