1. | Neoplasms (Cancer)
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2. | Breast Neoplasms (Breast Cancer)
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3. | Avian Sarcoma
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4. | Acquired Immunodeficiency Syndrome (AIDS)
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1. | RNA-Directed DNA Polymerase (Reverse Transcriptase)
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2. | DNA-Directed DNA Polymerase (Polymerases, DNA)
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3. | Magnesium
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4. | Enzymes
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5. | Cations
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6. | Carcinogens
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