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Growth of L. delbrueckii subsp. lactis ATCC 7830 in vitamin B12-free medium supplemented with CE of L. reuteri CRL1098 (▪), CN-Cbl (•), CE of L. plantarum ATCC 8014 (○), and saline solution (▿). Results for a CE sterility control, ◊, are also shown. O.D560, optical density at 560 nm. L. delbrueckii ATCC 7830 was preserved in MRS broth (9) plus glycerol at −70°C.
