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What causes the appearance of the positive result for indole test tryptophan is broken down...

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What causes the appearance of the positive result for indole test tryptophan is broken down product reacts with Kovac s reagent and turns red O hydrogen sulfide H2S is made it reacts with iron in the media and turns black O phenylalanine is broken down breakdown product reacts with FeCl3 and turns green ammonia is produced and this turns phenol red hot pink

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