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noun
res·azur·in
rez-ˈazh-ə-rən 
: a blue crystalline dye C12H7NO4 used chiefly as an oxidation-reduction indicator in the resazurin test for bacteria
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“Resazurin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/resazurin. Accessed 4 Dec. 2022.
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