= Quiescence
<Quiescence> is a reversible nonproliferating cellular state, often designated $G_0$, from which suitable signals can permit re-entry into the <cell cycle>. A <biological cell> in <quiescence> can retain active <metabolism>, maintain its specialized functions and respond to its environment. This distinguishes <quiescence> from <cell death> and from irreversible loss of proliferative capacity. For example, some resting <lymphocytes> resume <cell proliferation> after activation. <Molecular Biology of the Cell, 4th edition by Bruce Alberts and others>[Chapter 17, Extracellular Control of Cell Division, Cell Growth, and Apoptosis: G0]{ref}
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