e.g., penicillin and cephalosporin are produced by biotransformations in an industry valued several billions of dollars. Processes are conducted in vessels up to 60,000 gal in volume. Sugars, methionine, and ammonium salts are used as C,S,N sources. Genetically modified Penicillium chrysogenum is employed for penicillin production.

Some steroids are hydroxylated in vitro to give drugs.

Sugars

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