Fig. 6
Spearman correlation between the related indicators of gut and brain. Axis label: red, BDNF and pro-inflammatory cytokines in the prefrontal cortex and hippocampus; blue, gut microbiota; black, gut metabolites. Numbers on the lower left area: value of correlation coefficient; symbols on the upper right area: results of correlation and significance test, *p < 0.05, **p < 0.01, ***p < 0.001