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Physcomitrella patens • • excellent cell biology hormone and light signaling pathways operative • few cell types & simple developmental pattern • polar tip growth and division • tolerant to water stress -------------------------------A Model System for Functional Studies • draft genome assembled* • gene targeting & RNAi • gene id from 2-d gels • 4x44 Agilent microarray • gene id by genetic map position • insertion and deletion libraries Quatrano, R. S., et al. (2007). Current Opinion in Plant Biology 10: 182-189. *Rensing, et al. (2008). Science 319: 64-69. Haploid, single-cell layer, leaf-like gametophores of P. patens