defined:

A type of virus that contains RNA as its genetic material. The RNA of the virus is translated into DNA, which inserts itself into an infected cell's own DNA. Retroviruses can cause many diseases, including some cancers and AIDS.

explained:

Listen to a detailed explanation. (Requires the free RealPlayer download)

Dr. Richard Morgan, formerly of the National Human Genome Research Institute's Clinical Gene Therapy Branch, defines retrovirus.

related
terms:

ribonucleic acid (RNA), deoxyribonucleic acid (DNA), cell, cancer, human immunodeficiency virus (HIV)/acquired immunodeficiency syndrome (AIDS)

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