Reacción a "Genomic analysis clarifies the chronology of Neanderthal-modern human admixture and its genetic impact on our species"

This work addresses the phenomenon of hybridization between Neanderthals and modern humans. It is a study that includes a large volume of genomic information data, both from current populations and, more importantly, from humans of the past. The work, very solid in its structure and development, confirms a number of previous results related to:  

1. The timing of hybridization (between 50,500 and 43,500 years ago). 
2. The number of hybrid events (only one in populations after 40,000 years ago). 
3. The effect of the conservation of Neanderthal genes in our chromosomes. 

This last point ratifies the idea that the negative selection (elimination) of Neandertal chromosomal segments occurred very quickly, immediately after the hybridization event. This sweep of Neanderthal inheritance in our chromosomes gave rise to the so-called 'genetic deserts'. On the other hand, and in the opposite direction, it is confirmed that all humans of non-African origin retain between 1% and 2% of Neanderthal DNA, whose functions are essentially related to skin pigmentation, metabolism and the immune system.