Arnosti, D.N. (2011). Transcriptional repressors: shutting off gene expression at the source affects developmental dynamics.  Curr. Biol. 21(20): R859--R860.

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Developmental networks feature genes interlinked by transcriptional activation and repression. A new study indicates that repressors can 'shut the door' to newly initiating polymerases, allowing longer target genes to produce latent transcripts after shorter genes have been effectively silenced.