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First, last, and total days of detection of probiotic strains in the fecal samples of volunteers receiving the 7 billion (black circles) and 70 billion (blue circles) formulations as demonstrated by qPCR analyses. Statistical analysis was performed according to a two-tailed unpaired t-test; *, p < 0.05; **, p < 0.01; ****, p < 0.0001.
