Colourless, endogenous or exogenous pigment precursors that may be transformed by biological mechanisms into coloured compounds; used in biochemical assays and in diagnosis as indicators, especially in the form of enzyme substrates. Synonym: chromogens (not to be confused with pigment-synthesizing bacteria also called chromogens).
(12 Dec 1998)
Terms mentioned in text: endogenous, exogenous, pigment, precursors, biological, mechanisms, compounds, biochemical, diagnosis, indicators, enzyme, substrates, chromogens, bacteria
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