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A gene encoding valine dehydrogenase (Vdh) has been cloned from Streptomyces albus, a salinomycin producer, and expressed in Escherichia coli. The S. albus Vdh is composed of 364 amino acids that showed high homology with several other amino acid dehydrogenases as well as Vdhs from Streptomyces spp. and leucine and phenylalanine dehydrogenases (Ldh and Pdh) from Bacillus spp. A protein of 38 kDa,...