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Microscopy images of India ink negatively stained S. thermophilus strains. Staining was performed for two wild-type strains and two phage-resistant mutants: 1, STCH_15; 2, STCH_15_BIM_1; 3, STCH_15_BIM_2; 4, STCH_12. Presence of capsular polysaccharide is indicated with arrows. Scale bars, 1 μm.
