| trans-activation (genetics) | Increased rate of gene expression directed by either viral or cellular proteins. These regulatory factors (diffusible gene products) act in trans -- that is, act on homologous or heterologous molecules of DNA. (cis-acting factors act only on homologous molecules.) (12 Dec 1998) |
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| transactivation | <molecular biology> Stimulation of transcription by a transcription factor binding to DNA and activating adjacent proteins. (17 Mar 1998) |
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