(a) Survival of L. rhamnosus GG in simulated gastric juice containing glucose, pH 2.0 (▪), and dilute HCl, pH 2.0 (▴); (b) survival of L. rhamnosus GG in simulated gastric juice, pH 2.0, without lysozyme (▴), KCl (•), glucose (♦), CaCl2 (▪), pepsin (▵), or KH2PO4 (○); (c) survival of L. rhamnosus GG in dilute HCl, pH 2.0, in the presence (▴) or absence (▪) of 19.4 mM glucose. The data are the means of triplicate experiments, and the error bars indicate standard deviations.