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www.redcrossblood.org/learn-about-blood/blood-types.html

Learn how these blood groups are used during the blood donation process. ... There are four major blood groups determined by the presence or absence of two  ...

kidshealth.org/en/teens/blood-types.html

It might seem like blood is blood — it all looks pretty much the same to the naked eye. ... The four main blood groups are:.

www.infoplease.com/science-health/health/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 ...

anthro.palomar.edu/blood/ABO_system.htm

All humans and many other primates can be typed for the ABO blood group. There are four principal types: A, B, AB, and O. There are two antigens and two ...

thebloodconnection.org/about-blood/blood-education/blood-types

Human blood is divided into one of four main blood types (A, B, AB, and O) and are based on the presence or absence of specific antigens on red blood cells.

www.livescience.com/36559-common-blood-type-donation.html

Jul 13, 2012 ... The most common blood type among people in the U.S. is type O-positive.

www.nhs.uk/conditions/blood-groups/Pages/Introduction.aspx

May 12, 2017 ... There are four main blood groups (types of blood) – A, B, AB and O. Your blood group is determined by the genes you inherit from your parents.

www.webmd.com/a-to-z-guides/blood-type-test

Blood type tests are done before a person receives a blood transfusion and to ... The ABO test shows that people have one of four blood types: A, B, AB, or O. If ...

www.chegg.com/homework-help/questions-and-answers/regarding-four-blood-types-b-ab-o-explain-1-terms-carbohydrate-components-characterizes-2--q11796229

Answer to Regarding the four blood types A, B, AB and O explain: 1. What, in terms of carbohydrate components, characterizes each?...