Researchers from the University of Aix-Marseille studied the genomes of several ancient individuals—Neanderthals, Denisovans, and Homo sapiens ... fetus's red blood cells a threat, leading ...

Perhaps the biggest difference was that we—meaning people of our species, Homo sapiens—were only one ... functions that occur within our cells? Does this DNA influence traits like eye color ...

"For any case of inbreeding of a Neanderthal female with a Homo sapiens or Denisova male, there is a high risk of hemolytic ...

Today, there are more than eight billion of us. Logically, then, there must have been a moment when Homo sapiens became a distinct species. Yet that moment is surprisingly hard to pin down.