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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

Are type A, type AB, type B or type O? Did you know what the four blood types are ? Learn more from Infoplease! Each blood type is also grouped by its Rhesus ...

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.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.

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.

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.mnn.com/health/fitness-well-being/stories/what-your-blood-type-says-about-you

Oct 24, 2014 ... Human blood is made of the same basic elements, but within that realm there are distinctions that account for four different blood types (further ...

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 ...