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Transmission electron micrographs of wild-type and ΔexsY spores of B. anthracis. Thin sections of spores of the wild-type Sterne strain (WT) produced in liquid medium (A) and spores of strain CLT325 (ΔexsY) produced on solid (B) or in liquid (C) medium were examined. Arrowheads point to the exosporium (A) or cap-like exosporium fragment (B). The magnifications of all image are identical.
