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Increased cell numbers of L. delbrueckii subsp. bulgaricus LBB.B5-R during incubation in milk with the addition of purine (adenine [A] or guanine [G]) or pyrimidine (uracil [U]) bases. Data are shown as mean ± SE. ***, P < 0.001, **, P < 0.01, and *, P < 0.05, by Student’s t test.
