Use of the BN software to compare digitized V3 and V6-V8 profiles for the identification of bifidobacteria present in four artificial mixtures mimicking the human intestine (A), the rumen (B), the chicken intestine (C), and an environmental sample (D). Panel A also contains the V3 and V6-V8 profiles of two fecal samples. Fecal sample A contains B. adolescentis, B. bifidum, B. catenulatum, B. gallicum, and B. infantis, and fecal sample B contains B. adolescentis, B. angulatum, B. bifidum, and B. catenulatum.