What is “the basal body part”? Basal body is an organelle of eukaryotic cell. If this means the connection of junctional pore tube and inner membrane, it is clearly seen in the figure, as well as in old paper by Halfen and Castenholz. A high quality figure is provided as Supplementary Figure S1. The “bulges” in the inner membrane are also visible. In the Line 183, the description was revised.
Additionally, the authors sequenced the genome of this organism and identified homologs to genes conserved among filamentous cyanobacteria that have been demonstrated to be essential for motility in Nostoc punctiforme and may encode for the junctional pore proteins (hps locus) or a chemotaxis system (hmp locus).