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(a) Calinski-Harabasz (CH) index showing optimal number of clusters. (b) Principal coordinate analysis of overall composition of genera communities. (c, d) Two abundant genera in corresponding clusters of urban (green) and traditional rural (red) individuals. Two optimal clusters were revealed by CH index after clustering genus abundances using Jensen-Shannon divergence and partitioning around medoids (PAM) clustering algorithm, which derives from basic k-means algorithm.
