Gut microbiota contribute to FMD-induced neuroprotection in PD. (a) Experimental scheme of antibiotic cocktail treatment and fecal microbiota transplantation. (b, c) DA (b) and 5-HT (c) concentrations in the striatum of mice with transplanting different microbiota following pretreatment with antibiotic cocktails, F3,28 = 4.356, p < 0.001 and F3,28 = 5.917, p = 0.003, respectively, n = 8 mice per group. Statistical comparison by one-way ANOVA with post hoc comparisons of LSD; data represent the means ± SEM; *p < 0.05, **p < 0.01, ***p < 0.001