This journal provides immediate access to some articles. Volume 266(1421); April 22, 1999 Phylogenetic evidence for a single long-lived clade of crustacean cyclic parthenogens and its implications for the evolution of sex PMCID: PMC1689911 Geographical structuring of mitochondrial DNA in Chalcides sexlineatus within the island of Gran Canaria PMCID: PMC1689902 | ||