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The term arthrospores has been given to them to indicate that they are formed as joints or segments, and this term may be a convenient one to retain although the bodies in question are not true spores. Still a different method of spore formation occurs in a few peculiar bacteria. The spores thus formed may not be all alike, differences in size being noticed.
Commonly the spores break out of the rod, and the rod producing them dies, although sometimes the rod may continue its activity even after the spores have been produced. Certain species of bacteria do not produce spores as just described, but may give rise to bodies that are sometimes called arthrospores. These bodies are formed as short segments of rods.
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