For Transcription Factor we have terms and definitions in 3 topics. The topics are Genome, Huntingtons Disease and Microbiology.

A protein that binds to regulatory regions and helps control gene expression.
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A protein that aids in transcription.
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A protein which controls the transcription of genes. These usually bind to DNA as part of their function (but not necessarily). A transcription factor may be general (i.e. acting on many or all genes in all tissues), or tissue-specific (i.e. present only in a particular cell type, and activating the genes restricted to that cell type). Its activity may be constitutive, or may depend on the presence of some stimulus; for example, the glucocorticoid receptor is a transcription factor which is active only when glucocorticoids are present.
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