= Cell viability
<Cell viability> is the capacity of a <biological cell> to remain alive under specified conditions. Measurements use operational indicators such as intact <cell membranes>, metabolic activity or the ability to produce descendants. These indicators answer different questions: a membrane-intact <biological cell> can be alive yet unable to complete <cell division>. Consequently, a viability percentage needs an assay definition and a denominator, and should be distinguished from <cell proliferation>. <Animal Cell Culture Guide by ATCC>[Cell viability: dye exclusion, recovery and culture assessment]{ref}
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