Pronunciation: fe'nol-sul'fon-thal'e-in, -thal'en
An indicator in tissue culture media (yellow at pH 6.8, red at pH 8.4); occurs as a bright to dark red crystalline powder; in the past given by parenteral injection as a test for renal function.
Synonym(s): phenol red
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Examples: glitazone, GI cocktail, etc.