Fig. 4: The three cell types’ network.
From: ‘Social’ versus ‘asocial’ cells—dynamic competition flux balance analysis

Cell type 3 is a mutant of cell type 1 just losing the regulation by and of cell type 2, and is taken to exemplify an ‘asocial cell’ as it does not engage in cross regulation. All three cell types equally require X and Y for growth. Cell types 1 and 3 both produce X whilst cell type 2 produces Y.