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 »

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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 »