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Decarboxylase media are used in the biochemical differentiation of gram-negative enteric bacilli based on the production of arginine dihydrolase and lysine and ornithine decarboxylase.

Decarboxylase Medium Base, with added arginine, lysine or ornithine is used for the same purpose.

Lysine Decarboxylase Broth is used for differentiating microorganisms based on lysine decarboxylation.

Decarboxylase tests are important in the differentiation and identification of a wide variety of microorganisms and are outlined in numerous standard methods.