Cover illustration: The cover inset shows an electron microscopy image of Arabidopsis thaliana pollen grains superimposed on a pseudo-coloured scan of an oligonucleotide microarray (copyright: Jürgen Berger/Heiko Schoof, Electron Microscopy Unit, Max Planck Institut Tübingen, Germany). An analysis of the genetic background of pollen development in terms of transcriptional profiling of arabidopsis pollen grains and microgametogenesis together with proteome analyses of arabidopsis pollen are provided by Becker and Feijó (pp. 1117-1123).
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