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en.wikipedia.org/wiki/Blood_type

Blood group systems. A complete blood type would describe a full set of 30 substances on the surface of red blood cells, and an individual's blood type is one of many possible combinations of blood-group antigens. Across the 36 blood group systems, 308 different blood-group antigens have been found.

www.quora.com/What-are-the-different-human-blood-groups-and-types

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. Each group can be either RhD positive or RhD negative, which means your blood group can be one of the eight types.

readanddigest.com/know-your-blood-type-different-types-of-blood-groups

These combined with the ABO system of blood grouping may fall one among the eight blood group Types known as A+, A-, B+, B-, AB+, AB-, O+, or O-. Genetic Inheritance of Blood Types Similar to the characteristic traits that an individual inherits from his parents, so also is the blood Type, which has a genetic inheritance.

www.redcrossblood.org/donate-blood/blood-types.html?icid=rdrt-blood-types&imed=...

There are four major blood groups determined by the presence or absence of two antigens – A and B – on the surface of red blood cells. In addition to the A and B antigens, there is a protein called the Rh factor, which can be either present (+) or absent (–), creating the 8 most common blood types (A+, A-, B+, B-, O+, O-, AB+, AB-).

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

Blood might look the same and do the same job, but tiny cell markers mean one person's body can reject another person's blood. Find out how blood types work in this article for teens.

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

Blood Types (Groups) 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.

stylesatlife.com/articles/types-of-blood-groups

It is composed of plasma and different types of cells. Blood constitutes different type of corpuscles in it. They are known red blood corpuscles, leukocytes and thrombocytes. For those who want to know how many types of blood groups in human body: Red blood cells constitute 45 % of blood; plasma is about 54.3% and leukocytes of 0.7%.

www.medicalnewstoday.com/articles/218285.php

Blood types depend on the content of the blood cells and are inherited from parents. There are eight common blood types, and receiving a donation of each affects the immune system in a different ...

www.worldatlas.com/articles/what-are-the-different-blood-types.html

Parents pass their blood groups to their offspring who inherit them as the contribution of the blood types of both parents. ABO and Rh blood types are the major human blood types. It is possible that the blood type of a pregnant woman can be different from that of her fetus, a typical case for most pregnant women.

www.nhs.uk/conditions/Blood-groups

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. Each group can be either RhD positive or RhD negative, which means in total there are eight main blood groups. Blood is made up of red blood cells, white ...