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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

So medical experts group blood into types based on the different markers. The four main blood groups are: Type A. This ...

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 ...

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 ... blood type distribution may be different for specific racial and ethnic groups.

www.thoughtco.com/blood-types-373447

Feb 8, 2017 ... These identifiers, also called antigens, help the body's immune system to recognize it's own red blood cell type. There are four main ABO blood ...

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.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.

anthro.palomar.edu/blood/ABO_system.htm

In 1930, he belatedly received the Nobel Prize for his discovery of blood types. All humans and many other primates can be typed for the ABO blood group.

www.biology.arizona.edu/human_bio/problem_sets/blood_types/genotypes.html

Oct 23, 1997 ... A blood test is used to determine whether the A and/or B characteristics are present in a blood sample. It is not possible to determine the exact ...

www.todayifoundout.com/index.php/2013/06/how-blood-works-and-the-difference-between-blood-types

Jun 18, 2013 ... There are 8 main types of blood separated into 4 groups. The groups are A, B, AB , and O. They are grouped together by the presence or ...