Fig. 3

Identification of differentially expressed metabolites. A and B The Volcano and heatmap of differentially expressed metabolites between atrophic gastritis group and non atrophic gastritis group. C Differentially expressed metabolites correlation network diagram. The thickness of the lines represents the degree of relevance, the red line represents positive correlation, and the blue line represents negative correlation. D Correlation heatmap of the top 20 metabolites with most significant differences. E KEGG analysis based on differentially expressed metabolites