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Karl Landsteiner showed that people have different types of blood.
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Charles Drew showed that emergency transfusions could successfully be done with plasma if whole blood was not available.
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Helen Taussig identified the heart flaw that causes the skin of some newborn babies to be a bluish color.
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Christiaan Barnard performed the first tranplant of a human heart.
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Robert Jarvik implanted the first artificial heart into a patient.
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The United States government approved a device that uses a laser to burn away material causing blockage in arteries.
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