In a far away city called Grant City, the main export and production products are the widgets, Proteins. The entire town is designed to build and export widgets. The town hall, Nucleus, has the instructions for widget making. Widgets come in all shapes and sizes and any citizen of Grant can get the instructions and begin making their own widgets. Widgets are generally produced in small shops, Ribosome around the city; these small shops can be built by the carpenter's union, Nucleolus (whose headquarters are in town hall, Nucleus).
After the widget is constructed, they are placed on special carts, Chromosomes, which can deliver the widget anywhere in the city through the highways, Endoplasmic Reticulum. In order for a widget to be exported, the carts take the widget to the postal office, Golgi Bodies, where the widgets are packaged and labeled for export. Sometimes widgets don't turn out right, and the "rejects" are sent to the scrap yard, Lysosome, where they are broken down for parts or destroyed altogether.
The town powers the widget shops and carts from a hydraulic dam, Vacuole, which is in the city. The entire city is enclosed by a large wooden fence, Cell Membrane, only the postal trucks (and citizens with proper passports) are allowed outside the city.