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Schematic of a dormant Bacillus subtilis spore. Spores of all species share similar morphological features, namely a coat, which in this species can be sub-divided into distinct inner and outer layers, a peptidoglycan cortex, and a membrane bound spore core. The nucleoid comprises DNA encrusted by protective SASP proteins, visible as clusters of ordered dots. mRNA content is present only within the spore core.
