The current paper is focused on Phormidium. We never used Myxobacteria, and we have no idea about the motility in Myxobacteria. To clarify the situation, the mention to Myxobacteria was added in the text.
Finally, the authors performed a detailed characterization of the motility of individual filaments of the organism by time lapse microscopy providing additional evidence that would appear to support polysaccharide secretion as the driving force for motility, and provide a model for how this motility drives the formation of supercellular structures; in this case, spirals.