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

In fact, there are eight different common blood types. ... There are four major blood groups determined by the presence or absence of two antigens – A and B  ...

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 ...

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 ...

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.

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 ...

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.popsci.com/science/article/2012-02/there-are-way-more-blood-types-you-think

Feb 24, 2012 ... But what we were more struck by in this press release was the fact that these two new blood types--named Junior and Langereis--bring the total ...

www.carterbloodcare.org/blood-facts/blood-types

There are four main blood types (A, B, O and AB). The right blood type at the right time can save lives in your community. Learn more about your blood type.