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Scanning electron microscopy of Brazilian kefir grain microbiota. A, C, E: outer grain portions, B, D, F: inner grain portions. Arrows - Micrography A: cocci; Micrography D: fibrillar material - kefiran polysaccharide; Micrography E: arrow 1 - granular material - coagulated protein, arrow 2 - different yeast species.
