- Blood Types Tutorial
 - Features notes on human ABO markers, genotypes, inheritance of blood types, Rh factor, and a blood type calculator. - Go Ask Alice!: The ABOs of Blood Types
- Answers a question on the compatibility of blood types.
- Human Blood: ABO Blood Types
- Defines the four blood types (A, B, AB, and O). Also presents information on genetic inheritance patterns of the various types.
- What's Your Type?
- Information from The Franklin Institute. Includes notes on the types of blood that can be mixed when a person receives a blood transfusion, plus an explanation of Rh factors.
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