PCA and species composition analysis of the intestinal flora in C57BL/6 mice. (A) PCA analysis of all samples. (B) PCA analysis of chow-diet group, choline-diet group and choline-diet+TMAO group. (C) PCA analysis of the chow-diet group, choline-diet group and choline-diet+NAC group. (D) PCA analysis of chow-diet group, choline-diet group and choline-diet+LP 8198 group. (E) Venn diagram analysis of all samples. (F) Venn diagram analysis of chow-diet group, choline-diet group and choline-diet+TMAO group. (G) Venn diagram analysis of chow-diet group, choline-diet group and choline-diet+NAC group. (H) Venn diagram analysis of chow-diet group, choline-diet group and choline-diet+LP 8198 group. n = 5 per group.