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Clostridium botulinum bacteria in endospore stage

Photomicrograph depicting numerous Clostridium botulinum bacteria in their endospore stage, which had been highlighted after being processed using the malachite green staining method. The endospores appear as green spheres, whereas the bacilli themselves stain a purple color. (Source: Photography by Larry Stauffer, Oregon State Public Health Laboratory, 2002. Public Health Image Library ID# 1931, Centers for Disease Control and Prevention, Atlanta, Georgia. Public domain.)