has primary input amino-acid zwitterion response to amino acid cellular response to chemical stimulus cellular response to acid chemical cellular response to amino acid stimulus cellular response to amino acid GO:0071230 2009-12-03T02:08:11Z 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 an amino acid stimulus. An amino acid is a carboxylic acids containing one or more amino groups. mah