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en.wikipedia.org/wiki/ABO_blood_group_system

The ABO blood group system is used to denote the presence of one, both, or neither of the A and B antigens on erythrocytes. In human blood transfusions it is the most important of the 36 different blood type (or group) classification systems currently recognized.

www.redcrossblood.org/donate-blood/blood-types.html

Blood types are determined by the presence or absence of certain antigens – substances that can trigger an immune response if they are foreign to the body. Since some antigens can trigger a patient's immune system to attack the transfused blood, safe blood transfusions depend on careful blood typing and cross-matching. ...

www.drgreene.com/understanding-blood-types

Nevertheless, understanding blood types, and the genetics of human blood is far easier than that of any other human tissue. To make things a little easier to understand, here are some guidelines for understanding how both the ABO blood types and the Rh system work. The ABO Blood Types. Each person receives an A, a B, or an O gene from each parent.

www.disabled-world.com/calculators-charts/blood-chart.php

A blood type (also called a blood group) is defined as the classification of blood based on the presence or absence of inherited antigenic substances on the surface of red blood cells (RBCs). A series of related blood types constitutes a blood group system, such as the Rh or ABO system.

www.infoplease.com/math-science/biology/human-body/all-about-blood-types

Human Body > All About Blood Types ; Cite. All About Blood Types Human blood is grouped into four types: A, B, AB, and O. Each letter refers to a kind of antigen, or protein, on the surface of red blood cells. For example, the surface of red blood cells in Type A blood has antigens known as A-antigens. The Rh Factor

anthro.palomar.edu/blood/ABO_system.htm

The most well-known and medically important blood types are in the ABO group. They were discovered in 1900 and 1901 at the University of Vienna by Karl Landsteiner in the process of trying to learn why blood transfusions sometimes cause death and at other times save a patient.

www.netwellness.org/healthtopics/blood/bloodtypes.cfm

Understanding Blood Types. Background. Your genetic code determines your hair and eye color, whether you are right or left handed, and whether you can curl your tongue, but it also determines your blood type. There are two main blood groups, the ABO group and the Rh group. The ABO group is made up of A, B, AB, or O blood types, and the Rh group ...

www.smithsonianmag.com/science-nature/the-mystery-of-human-blood-types-86993838

The Mystery of Human Blood Types The ABO blood group evolved at least 20 million years ago, but scientists still don’t understand the purpose of blood types.

www.britannica.com/science/ABO-blood-group-system

ABO blood group system, the classification of human blood based on the inherited properties of red blood cells (erythrocytes) as determined by the presence or absence of the antigens A and B, which are carried on the surface of the red cells. Persons may thus have type A, type B, type O, or type AB blood. The A, B, and O blood groups were first identified by Austrian immunologist Karl ...