<molecular biology> Hypothetical protein thought to regulate the transition of cells from G0 to G1 phase of the cell cycle and thus inevitably into S phase. The idea would be that the concentration of this unstable (u) protein would have to exceed a threshold level for triggering progression through the cycle and that this would only happen if the cell had adequate access to growth factors or to nutrients.

Synonyms: trigger protein.

This entry appears with permission from the Dictionary of Cell and Molecular Biology

(11 Mar 2008)

up-regulation (physiology), upright, Upright Database Technology AB < Prev | Next > uprun, UPS, upsarokas, upset

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