Of the 61 known blood group antigens, the negative/positive distinction refers solely to antigen D. During blood transfusion, ...

If Neanderthal women mated with Homo sapiens or Denisovan men, there was a high risk of newborns having neonatal hemolytic disease.

It's a bit simplistic, but you can think of the Rh factor as a protein that is either present (positive) or absent (negative) on red blood cells. Exact percentages vary with race, but most people ...

The club's aim is to overcome this crisis, said Sutapa Chakraborty, a member. The RH negative blood group is rare and the difficulty in procuring negative blood in times of emergencies ...