There are a total of eight blood groups in humans, determined by the presence or absence of antigens and antibodies. The groups are type O positive and negative, type A positive and negative, type B positive and negative... More »

AB- is the rarest of the commonly recognized blood types, though the extremely rare Rh-null type is the rarest of all blood types. A blood type is considered rare when fewer than one in 1,000 people carry it. More » Science Human Anatomy Blood

The main types of human relationships are romantic relationships, friendships, casual relationships, family relationships and professional relationships. According to Neha Sharma, people develop relationships out of trus... More »

B cells are white blood cells that differentiate into plasma B cells and produce antibodies specified for certain antigens. These cells can produce many antibodies in order to eradicate the foreign antigens from the huma... More »

In type AB blood, A antigens and B antigens are present on the red blood cells, according to the National Center for Biotechnology Information. The serum portion of AB blood does not contain any blood antibodies. More »

Blood type is determined by the specific antigens found in the blood. B blood type contains only the B antigen on the red cells, with an A antibody in the plasma. A third antigen, known as the Rh factor, determines wheth... More »

Blood of the AB type has both A antigens and B antigens carried on red blood cells but lacks both A and B antibodies in its plasma. These characteristics make the AB blood type the most restricted with regard to red cell... More »