TEK IMAGE / SCIENCE PHOTO LIBRARY TEK IMAGE / SCIENCE PHOTO LIBRARY
Blood group test showing reactions between blood types (down right) and their antibodies (across top). There are four human blood types: A, B, AB and O. Type A blood has type A antigens on its blood cells and anti-B antibodies in its serum. Type B blood is the reverse. Mixing type A blood with anti-A antibodies leads to an agglutination reaction, the result of which is seen as dense red dots. AB blood has both A and B antigens on its cells, but no antibodies. Type O blood has both antibodies and no antigens. Anti-D is an antibody used to test for Rhesus antigens, and it reacts with Rhesus positive blood. Typing is necessary to prevent reactions during blood transfusions.
Model release not required. Property release not required.