Table 3.

Additional Cellzilla arrow forms not recognized by Cellerator.

Arrow form*	Description
{X → X, Diffusion[PI, PO]}	Diffusion of X through the tissue. PI is the permeability of internal cell walls; the optional PO is the permeability of tissue boundary cell walls. Each may be specified as f[i, j, k] where i, j, k are cell and wall indices.
{X → X, Transport[fout, fin]}	Controlled transport of X across the cell wall.
{X ↦ Y, IGRN[v, T, n, h]}	${[\mathrm{Y}[\mathrm{j}]]}^{\prime }\text{=}\frac{v}{\text{1+}\exp (-h-T·{[X[i]]}^n)}$
{cell → cell, Grow[…]}	Specification of cell growth parameters: Pressure, growth rate, spring constant.
{cell → cell + cell, model[…]}	Specification of cell division model and parameters.

^*Except for the IGRN the arrows here are longer versions of the right-pointing arrows used by the canonical Cellerator mass-action expansion.