The Dichotomous Key...
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Is the cell motile...?
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Only a few filamentous microorganisms in activated sludge are
motile. Beggiatoa spp., Flexibacter spp., and some
blue - green bacteria (Cyanophyceae) are motile by gliding;
Thiothrix spp., and Type 021N may display limited "twitching"
or swaying motions.