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Morphological changes in P. freudenreichii SI41 during bile salts stress. Nontreated cells (a), cells exposed to extreme bile salts challenge (1.0 g/liter, 1 h) (b), and bile salts-adapted cells (0.2 g/liter, 4 h) exposed to extreme bile salts challenge (1.0 g/liter, 1 h) (c) were examined by scanning electron microscopy.
