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Urea crystals

Hippuric acid crystals

Bacteria metabolites from the respiratory tract

Crystals of malic acid, an intermediate in the TCA cycle. This chemical occurs naturally in certain foods giving them a tart flavour and when added to food it is labelled as E296.

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Urea crystals

Hippuric acid crystals

Urea crystals

Urea crystals

Crystals of malic acid, an intermediate in the TCA cycle. This chemical occurs naturally in certain foods giving them a tart flavour and when added to food it is labelled as E296.