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Authored: Le Novere, N, Jassal, B, 2004-03-31 12:22:05,
Calcium, as the ion Ca2+, is essential in many biological processes. The majority of Ca2+ in many organisms is bound to phosphates which form skeletal structures and also buffer Ca2+ levels in extracellular fluids (typically 1 millimolar). Intracellular free Ca2+, by contrast, is 10,000 times lower than the outside of the cell (typically 10 micromolar). This concentration gradient is used to import Ca2+ into cells where it acts as a second messenger.,
Edited: Jassal, B, 2008-11-06 10:17:49,
Reviewed: Castagnoli, L, 2008-11-06 12:55:54
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Ca-dependent events
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