title: The lambda - P22 problem.
abstract: Lambda and P22 are members of 2 families of tailed phages and have limited genomic relationships. Both form hybrids with many phages. P22 appears as a hybrid of mixed ancestry. Despite their similarities, lambda and P22 and their relatives form 2 distinct lineages and must be classified separately.
authors.affiliation: Department of Microbiology-Infectiology and Immunology; Medical School; Laval University ; Quebec, QC Canada.
authors.forename: Hans-W
authors.initials: HW
authors.lastname: Ackermann
keywords: P22; classification; lambda