Medical

antisigma factor

a regulatory agent that controls the activity of specific alternative SIGMA FACTORS. The antisigma factor may be a protein that holds the sigma factor in an inactive complex; the inhibitory action being reversed by an anti-antisigma factor.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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sigma factor

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