We thank the reviewers for giving us helpful comments. This study is our new exploration into a new field, and the comments from different fields help us to revise our manuscript. The text was revised according to the comments. In addition, Figure 3A was replaced by a figure of better contrast. Because the EM figures are difficult to view within the Word document, we provide a high-quality figure as a supplement. Within the text, corrected words are highlighted.
A few major comments can be found below concerning R2 the possible presence of type IV pili in their EM images, some confusion regarding descriptions of motility analysis and others.