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Examples of substances present in cerebrospinal fluid. BDNF—brain-derived neurotrophic factor; Ca2+—calcium ions; Cl−—chloride ions; HCO3−—bicarbonate ions; IGF-2—insulin-like growth factor 2; K+—potassium ions; Mg2+—magnesium ions; Mn2+—manganate ions; Na+—sodium ions.
