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Fluorescence of the reporter dye is turned on by rapid removal of the quinone quencher , an event that immediately occurs only after highly selective , two - electron reduction of the sterically and conformationally restricted quinone substrate by the cancer - associated human NAD ( P ) H : quinone oxidoreductase isozyme 1 ( hNQO1 ) .
 quinone, quinone, quinone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 quinone, quinone, quinone