Fig. 5.

Author keyword cluster analysis. The size of the circle indicates the frequency of keyword occurrence; the color of the circle indicates the type of clustering: changes in intestinal flora in IBD (blue), changes in metabolites (red), changes in host signaling pathways caused by flora and metabolites (green), probiotic treatment (yellow); the connection indicates the co-occurrence relationship of keywords. The most relevant nodes belong to the same cluster with the same color, which indicates a close cooperative relationship. The size of the node and the width of the connecting line are related to the relative degree of co-occurrence between nodes and the relative strength of the co-occurrence relationship.