Fig. 6
Vitamin B12 influence the modules and the keystone taxa in the gut ecological network. a Network modules in different groups. Large modules (> 5 nodes) are shown in circular layout. Major phyla are indicated by the node colors. Positive and negative correlations are indicated by red and green connections, respectively. The matching pie charts for each network in the right panel indicate the distribution of the major phyla. The module ID of each large module is indicated by M1 to M6. b Classification of nodes in CK and B networks to find possible keystone OTUs. Each symbol represents an OTU. Pale green symbols represent the nodes in group B. Pink symbols represent the nodes in group CK. Zi > 2.5 and Pi > 0.62 indicates network hubs; Zi > 2.5 and Pi ≤ 0.62 indicate module hubs; Zi ≤ 2.5 and Pi > 0.62 indicate connectors; and Zi ≤ 2.5 and Pi ≤ 0.62 indicate peripherals. Detailed taxonomic information for node is listed in Table S4