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U protein

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U protein

(Science: 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.

Synonym: trigger protein.