There are four main types of blood, A, O, AB, and B. Each of these types is divided into two different types: AB+, AB-, O+, O-, A+, A-, B+, and B-. As you can see, the blood types are divided between positive and negative types. The main difference between positive and negative blood types is the positive has the RhD antigen, while the negative does not. RH is a complex way of classifying blood.
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