The editing dialog for a Cell pathway is shown below:
The primary input that must be defined for a Cell pathway is the quantity of each medium present in the pathway. The Reference Fluid is automatically present in each Cell when it is first created. The number of additional Fluids and Solids that can be added to the Cell is unlimited, but most Cells will typically include no more than one or two additional media.
Learn more about:
Adding and Deleting Cell Media