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Growth of S. meliloti IFO 14782 and strain 16C18 on vitamin B6-free EMM agar after 16 h of incubation. (Left plate) Paper disks containing 150 ng pyridoxine; (right plate) paper disks containing 1.5 μg 4-hydroxy-l-threonine. The upper parts of the plates contained cultures of the 16C18 strain, while the lower parts of the plates contained cultures of the IFO 14782 strain.
