Negative blood group

Blood groups are of 4 types broadly as A, B, AB & O group in humans. These groups also have a bifurcation as positive blood group (+) and Negative blood group (-) as A+ve, B+ve, AB+ve, O+ve and also similarly as A-ve, B-ve, AB-ve, O-ve groups. So the underlying difference of positive (+) and negative (-) arises due to a substance termed Rhesus antigen [...] Continue reading →