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Karl Landsteiner introduces the system to classify blood into A, B, AB, and O groups
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Insulin first used to treat diabetes.
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First vaccine developed for diphtheria.
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First test-tube baby is born.
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Smallpox is eradicated.
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HIV, the virus that causes AIDS, is identified.
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Willem J. Kolff invented the artificial kidney dialysis machine.
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First vaccine developed for hepatitis A.
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Dolly the sheep becomes the first clone.
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First vaccine to target a cause of cancer.