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Presence of lactobacilli and/or bifidobacteria DNA in breast milk samples as determined by species-specific PCR (n = 160). Frequency of detection of DNA from genus Lactobacillus and/or Bifidobacterium (A) and lactobacilli and bifidobacterial species (B) in breast milk samples identified by species-specific PCR. The percentages are expressed over the total 160 samples analyzed. PCR = polymerase chain reaction.
