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Proceedings of the National Academy of Sciences of the United States of America P ROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Table of Contents Papers from a National Academy of Sciences Colloquium on Genetics and the Origin of Species Genetics and the origin of species: An introduction Francisco J.Ayala and Walter M.Fitch 7691–7697 Origin of Genes Walter Gilbert, Sandro J.de Souza, and Manyuan Long 7698–7703 Transposable elements as sources of variation in animals and plants Margaret G.Kidwell and Damon Lisch 7704–7711 Long term trends in the evolution of H(3) HA1 human influenza type A Walter M.Fitch, Robin M.Bush, Catherine A. Bender, and Nancy J.Cox 7712–7718 Genes, peoples, and languages L.Luca Cavalli-Sforza 7719–7724 DNA variation at the Sod locus of Drosophila melanogaster. An unfolding story of natural selection Richard R.Hudson, Alberto G.Sáez, and Francisco J.Ayala 7725–7729 Neutral behavior of shared polymorphism Andrew G.Clark 7730–7734 Divergent and conserved features in the spatial expression of the Drosophila pseudoobscura esterase-5B gene and the esterase-6 gene of Drosophila melanogaster Natalia A.Tamarina, Michael Z.Ludwig, and Rollin C.Richmond 7735–7741 A demographic approach to selection Wyatt W.Anderson and Takao K.Watanabe 7742–7747 Phylogenetics and the origin of species John C.Avise and Kurt Wollenberg 7748–7755 Assortative fertilization in Drosophila Therese Ann Markow 7756–7760 Incipient species formation in salamanders of the Ensatina complex David B.Wake 7761–7767 Genetics and the origin of bird species Peter R.Grant and B.Rosemary Grant 7768–7775
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Proceedings of the National Academy of Sciences of the United States of America Vagaries of the molecular clock Francisco J.Ayala 7776–7783 Evolution of codon usage bias in Drosophila Jeffrey R.Powell and Etsuko N.Moriyama 7784–7790 The evolution of plant nuclear genes Michael T.Clegg, Michael P.Cummings, and Mary L.Durbin 7791–7798 Evolution by the birth-and-death process in multigene families of the vertebrate immune system Masatoshi Nei, Xun Gu, and Tatyana Sitnikova 7799–7806