Fig. 3

Bacterial correlation networks consisting of core bacteria and their related bacteria for group X (Healthy) (left) and group Y (Stage_0) (right). Red nodes represent core bacteria, and gray nodes are genera that show a correlation of 0.4 or more with one or more core bacteria in any of the groups. Green edges represent pairs of genera that are not correlated in the other group, and gray edges represent those that are correlated in both groups. Each pair of genera is depicted as a thicker and denser edge when the correlation (branch weight) is greater. The size (area) of a node represents the relative abundance of the corresponding bacteria