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Transmission electron micrographs of endospores of Paenibacillus polymyxa grown on specific spore-forming medium at 30 °C for 48 h. A. Strain Hb1. B. Strain Hb6. C. Strain ShX302. D. Strain ShX303. ISC: inner spore coat. OSC: outer spore coat. MSC: middle spore coat. Bar = 0.5 µm.
