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. 2021 Feb 24;6:77. doi: 10.1038/s41392-020-00456-5

Fig. 6.

Fig. 6

BBR stimulated the production of dopamine in striatum in mice transplanted with E. faecalis or E. faecium: TMP-TFB-derivatized MALDI-MS images. a The relative abundance and distributions of dopamine with a spatial resolution of 200 µm. b Rescaled image from a with baseline subtraction and total ion count normalization. c The relative abundance and distributions of dopamine with a spatial resolution of 100 µm. d The relative abundance and distributions of dopamine in half brains from the same mice in c with a spatial resolution of 200 µm. All of them showed elevated levels of dopamine after BBR addition. (group 1: normal group; group 2: antibiotic treated only; group 3: antibiotics and E. faecalis; group 4: antibiotics, E. faecalis, and BBR (200 mg/kg); group 5: antibiotics, E. faecium; and group 6: antibiotics, E. faecium, and BBR (200 mg/kg)). Blue represents the decreased level and red represents the increased level. The striatal dopamine level in the mice receiving both E. faecalis and BBR was higher than that treated with E. faecalis only (group 3 vs. group 4). The striatal dopamine in the mice receiving both E. faecium and BBR was higher than that treated with E. faecium only (group 5 vs. group 6)