Blood Types Explained - A, B, AB and O - Red Cross Blood
https://www.redcrossblood.org/donate-blood/blood-types.html
WebIn addition to the A and B antigens, there is a protein called the Rh factor, which can be either present (+) or absent (–), creating the 8 most common blood types ( A+, A- , B+, B- , O+, O- , AB+, AB- ). Click on a blood type below to learn more. Group A. Group B. Group AB. Group O. B. PLASMA. A. RED CELLS. Group A.
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