Figure 1
Photo: Rohan Wells, NIWA; Illustration: Alan Stonebraker

Figure 1: The aquatic Chara plant (left) is made up of long cylindrical cells (center). Inset: Proteins called myosin (green) transport nutrients in the form of spherical vesicles (pink) along counter-winding, helical tracks of actin (yellow) that line the cell walls. The transport pulls the viscous liquid at the interior of the cell along the walls (the velocity profile is indicated by the black arrows), which helps to mix the fluid perpendicular to the long axis of the plant (right) and move nutrients around the cell interior.