![](https://globalplantcouncil.org/wp-content/uploads/2020/07/180307_jaa_ram_dixit_0689_small-e1593585603225.jpg)
As a plant grows, it moves cellular material from its version of manufacturing sites to the cell wall construction zone. Transporter proteins, called motor proteins, are thought to move these cell wall cargo via a complex highway system made up of microtubule tracks. The position of these tracks must be stabilized so that cargo are delivered to the correct locations.