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Lactipl. plantarum WCFS1 (a) and Lent. buchneri DSM 20057 (b) were grown aerobically for 24 h at 37 °C in MRS medium without heme and menaquinone supplementation (-), with only heme supplementation (heme), and with heme and 20 ng/mL or 2 µg/mL menaquinone supplementation (heme + MK4). The blue bars represent the biomass formation (OD600), and the orange bars represent the final pH.
