| http://www.w3.org/ns/prov#value | - The diagnostic signal can be any assayable variable commonly used in the art, for example: changes in membrane potential of cells; increases or decreases in metabolites or ions such as ATP, cAMP, cGMP, phospholipids, calcium, etc.; changes in the transcription of certain genes; changes in fluorescent or chemiluminescent behaviour; changes in pH; changes in enzymatic activity; cell growth or inhibi
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