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Effect of cotβ on spore coat-surface topography. Wild-type Sterne (a and a1) and cotβ mutant (strain MGM68) spores (b, b1, and c) were analyzed by AFM in the tapping mode. Spore outlines and spore coat ridges imaged in (a) and (b) are indicated by white-dotted lines and arrows in (a1) and (b1), respectively. Scale bars represent 0.5 μm in (a), (b) and (c).
