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This journal provides immediate access to some articles. Volume 271(1551); September 22, 2004 Ice sheets promote speciation in boreal birds. PMCID: PMC1691815 Cross-Cordillera exchange mediated by the Panama Canal increased the species richness of local freshwater fish assemblages. PMCID: PMC1691808 A phylogenetic review of the African leaf chameleons: genus Rhampholeon (Chamaeleonidae): the role of vicariance and climate change in speciation. PMCID: PMC1691807 | ||