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Population of Bifidobacterium species in fecal samples collected from six human subjects over an 8-month period. (A) Volunteer A; (B) volunteer B; (C) volunteer C; (D) volunteer D; (E) volunteer E; (F) volunteer F. Symbols: •, Bifidobacterium; ▵, B. adolescentis group; ▪, B. catenulatum group; ○, B. longum; ▴, B. bifidum; □, B. breve; ♦, B. angulatum.
