UNDER THE SKIN Researchers have discovered mysterious structures, such as these bubblelike compartments called vesicles that sit between the cell membrane (cyan) and the cell wall (purple) of the bacterium Halothiobacillus neapolitanus (cryotomogram, top; 3-D reconstruction, bottom).
M.J. Dobro/Journal of Bacteriology 2017
On the surface, bacteria may appear bland.