The effect of archaic DNA on our health is a field of intense research.
Scientists at Aarhus University in Denmark, for example, have examined the genomes of more than 27,000 Icelanders for irregularities and oddities.
The study found Icelanders have inherited 3.3 percent of their DNA from Denisovans – an extinct species of ancient human – alongside the Neanderthal influences.
The researchers found five traits that appeared to be influenced by archaic DNA.
Men with one such variant, for instance, are slightly less likely to develop prostate cancer.
In another case, men and women with two other variants may be shorter and have faster clotting blood.