PBS
Pbs Teachers: Structured Treatment Interruption
Determine how studying the evolution of the HIV virus led medical experts to give patients a "holiday" from drugs, weakening the mutated, drug-resistent genes. Discover how this backward evolution works.
National Institutes of Health
U.s. National Library of Medicine: What Is Dna?
Scientific information about the hereditary material in all living things, DNA. Also includes links to fact sheets for quick reference.