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Abstract Cell proliferation generally promotes differentiation, whereas proliferative quiescence maintains stem cell identity—a paradigm well-established in adult mammalian stem cells. Here we report that in Arabidopsis bud precursor cells, meristematic cell fate maintenance depends on active cell-cycle progression. We identify two opposing mechanisms that balance trimethylated histone H3 Lys27 levels to regulate transcription of the shoot meristem marker gene SHOOT MERISTEMLESS (STM).
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