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E. coli pangenome and core genes based on 26 isolates. (A) Number of gene clusters shared in 1–26 isolates, respectively. According to their presence in different number of isolates, genes were further grouped into five gene sets: strain-specific genes, lowly-shared genes, moderately-shared genes, highly-shared genes, and core genes. (B) Pangenome size and core-genome size when the number of isolates varies from 1 to 26.
