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The proline operon of Halobacillus halophilus. The proline operon of Halobacillus halophilus comprises 3 genes encoding a pyrroline-5-carboxylate reductase (proH), a glutamate 5-kinase (proJ) and a glutamate 5-semialdehyde dehydrogenase (proA). The gene products are sufficient to synthesize proline from glutamate (Fig. 5).
