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Net extracellular folate production in 48-h cultures of B. adolescentis MB 114, MB 115, MB 227, and MB 239 and B. pseudocatenulatum MB 116 and MB 237 in SM7 supplemented with 0, 10, 25, or 50 ng ml−1 folate. Mean values from three separate experiments are reported; SDs were always less than 4.0 ng ml−1.
