TABLE 2.

Summary of microbiota cluster and their features in gut.

Cluster		Features	Alteration	References
Opportunistic pathogens	Porphyromonas Prevotella Corynebacterium	NLRP3 inflammasome LPS	Up	Spillantini et al., 1997
SCFA-producing bacteria	Blautia, Roseburia, Coprococcus Dorea Lachnospira Faecalibacterium Oscillospira Corynebacterium	SCFAs-producing Butyrate-producing Vagal activation	Down	Spillantini and Goedert, 2018; Xu et al., 2019
Probiotic bacteria	Lactobacillus Bifidobacteriaceae	Cellulose metabolism	Up	Kim and Alcalay, 2017
Cohesive bacteria	Clostridium Oscillospira Akkermansia Ruminococcaceae	–	Up	Spillantini and Goedert, 2018