Figure 1.

Detail of a typical two-dimensional GGH cell-lattice configuration. Each colored domain represents a single spatially-extended cell. The detail shows that each generalized cell is a set of cell-lattice sites (or pixel), $\overrightarrow{i}$, with a unique index, σ $\sigma \left(\overrightarrow{i}\right)$, here 4 or 7. The color denotes the cell type, $\tau \left(\sigma \left(\overrightarrow{i}\right)\right)$.