This journal provides immediate access to some articles. Volume 274(1627); November 22, 2007 Research Articles Adaptive evolution of genes underlying schizophrenia PMCID: PMC2288689 Spatial considerations for the allocation of pre-pandemic influenza vaccination in the United States PMCID: PMC2288690 The effect of energy reserves and food availability on optimal immune defence PMCID: PMC2373797 Enfleurage, lipid recycling and the origin of perfume collection in orchid bees PMCID: PMC2288683 Reed bunting females increase fitness through extra-pair mating with genetically dissimilar males PMCID: PMC2288684 A new theory for the evolution of polyandry as a means of inbreeding avoidance PMCID: PMC2288693 | ||