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Precise control of gene expression patterns is critical for the specification of cellular diversity during metazoan development. Polycomb group (PcG) proteins comprise a class of transcriptional modifiers that have dynamic and essential roles in regulating a number of key processes including lineage commitment. How this is accomplished during mammalian development is incompletely understood. Here,...
Two recent studies, including one in this issue of Cell Stem Cell, have identified novel regulators of embryonic stem cell (ESC) self-renewal using genome-wide RNAi screens in mouse ESCs (Ding et al., 2009; Hu et al., 2009) and have further expanded the repertoire of factors that regulate ESC identity.
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