Document 0622 DOCN M9460622 TI The fastest genome evolution ever described: HIV variation in situ. DT 9404 AU Wain-Hobson S; Unite de Retrovirologie Moleculaire, Institut Pasteur, Paris,; France. SO Curr Opin Genet Dev. 1993 Dec;3(6):878-83. Unique Identifier : AIDSLINE MED/94162897 AB Human immunodeficiency virus is an RNA virus in which the degree of genetic variation observed is phenomenal--up to 20% within an infected individual. This is essentially due to remorseless cycles of viral replication, most probably due to chronic activation of the immune system. It can be estimated that the number of variants in existence worldwide must be in excess of 10(14)-10(18), and given the nature of RNA viruses even more novel variants should emerge. DE Evolution *Genome, Viral Human HIV/*GENETICS/PHYSIOLOGY HIV Infections/MICROBIOLOGY Reverse Transcriptase/METABOLISM Support, Non-U.S. Gov't Time Factors *Variation (Genetics) JOURNAL ARTICLE REVIEW REVIEW, TUTORIAL SOURCE: National Library of Medicine. NOTICE: This material may be protected by Copyright Law (Title 17, U.S.Code).