Fig. 4

Function prediction. a Relative abundance analysis at species level in the fecal samples. b COG analysis showed that the bacteria represented in the guts of patients with silicosis were mainly involved in the following biological processes: cell wall/membrane/envelope biogenesis, carbohydrate transport and metabolism, transcription, inorganic ion transport and coenzyme transport and metabolism. A03 means the third sample in control group, B01 means the first sample in case group. c KEGG prediction analysis showed that the bacteria represented in the guts of patients with silicosis were mainly involved in the following biological processes: xenobiotic biodegradation and metabolism, cell motility, translation, nucleotide metabolism, metabolism of terpenoids and polyketides, and signal transduction and membrane transport. A03 means the third sample in control group, B01 means the first sample in case group