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Agglutination test with K 562(S) cells. (A) Cells treated with the PT digest of the chemically acidified dough at a concentration of 0.027 g/liter. (B) Cells treated with the PT digest of the sourdough started with selected lactobacilli, incubated for 24 h at 37°C, at a concentration of 3.5 g/liter.
