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Thin-section electron micrographs of spores with or without DPA. Spores were prepared for electron microscopy as described in Materials and Methods. The spores shown are PS832 (wild-type) (A), FB72 (Δger3) (B), and FB108 (Δger3 spoVF) (C). The bar in panel A denotes 1 μm, and the other two panels are at the same magnification as panel A.
