COVER A montage of pseudo-colored Arabidopsis inflorescence apices as observed by electron microscopy; wild types and leafy mutants alternate, starting with a wild type at the top left. The LEAFY gene is critical for acquisition of floral identity in angiosperms and sporophyte development in mosses. Changes in the DNA binding domain are responsible for differences in the biological activity of LEAFY between mosses and flowering plants. See page 260. [Image: A. Maizel and J. Berger]

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