title: Evolutionary relationships of the human immunodeficiency viruses.
abstract: The rapid accumulation of nucleotide sequence data on viral genes has allowed, for the first time, the development of detailed phylogenies of viruses based on an objective criterion. This has been demonstrated clearly in the recent analysis of the evolutionary relationships of HIV - the AIDS virus. When first characterized, HIV seemed aberrant and almost unique in many features. Now it is known to be one of a large group of immunodeficiency viruses, which are widely distributed among primates and other mammals.
authors.affiliation: Andrew Leigh Brown is at the Dept of Genetics, University of Edinburgh, Edinburgh EH9 3IN, UK.
authors.forename: A J
authors.initials: AJ
authors.lastname: Leigh Brown