Fig. 1.

Fecal levels of L. rhamnosus (a) and L. acidophilus NCFM (b) of the elderly volunteers after the run-in, the treatment, and the wash-out periods, as measured by quantitative PCR. The top and the bottom of the box represent upper and lower quartiles, respectively, and the band within the box is the median. The whiskers indicate the minimum and the maximum, and the average of the data is marked with “plus sign”