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Anaerobic cell aggregate and microbial cells. (A) Anaerobic cell aggregate at the end of cultivation at 10°C with a 0.5% inoculum size. Magnification, 100×3.2×2. (B) Methanosaeta-like cells (arrow 1), Methanospirillum-like cells (arrow 2), and presumably propionate-oxidizing bacteria (arrow 3) at the end of cultivation at 10°C with a 0.5% inoculum size. Magnification, 100×3.2×2.
