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To cultivate Lactobacillus and Bombilactobacillus species we used MRS supplemented with 2% fructose in both aerobic and anaerobic conditions and also MRS supplemented with 2% fructose and 0.1% L-cysteine. The second medium showed significantly better growth in both conditions therefore we attributed this effect to L-cysteine. Could anyone explain why exactly this would have made a difference?

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  • $\begingroup$ Welcome to the Biology Stack Exchange. Please take the tour and visit the help center for more information on this site. Please also note the homework requirement, as this question sounds very much like easily answerable homework. $\endgroup$
    – bob1
    Commented Mar 13 at 19:23

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