Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a pH stimulus with pH < 7. pH is a measure of the acidity or basicity of an aqueous solution. [GOC:go_curators, GOC:mah, Wikipedia:PH]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process