Table 2.

Definition of the symbols for pseudo-nodes used in Fig. 3

Symbol of pseudo-node	Relation to parent node(s)
Complementary nodes
$\bar{EN}$	not EN
$\bar{h h}$	not hh
$\bar{HH}$	not HH
$\bar{PTC}$	not PTC
$\bar{SLP}$	not SLP
$\bar{SMO}$	not SMO
Composite nodes corresponding to a single cell
${(CA \bar{ECR})}_{2}$	CIA₂ and $\bar{{EN}_{2}}$ and $\bar{{CIR}_{2}}$
${(CAS \bar{CR})}_{2}$	CIA₂ and SLP₂ and $\bar{{CIR}_{2}}$
(CSM)₂	CI₂ and SMO₂
${(E \bar{CR})}_{2}$	EN₂ and $\bar{{CIR}_{2}}$
${(w CA \bar{CR})}_{2}$	wg₂ and CIA₂ and $\bar{{CIR}_{2}}$
${(w S \bar{CR})}_{2}$	wg₂ and SLP₂ and $\bar{{CIR}_{2}}$
Composite nodes corresponding to intercellular interactions
C_ih_j	CI_i and hh_j
$C_{i} \bar{{SM}_{i} h_{j} h_{k}}$	CI_i and ${\bar{SMO}}_{i}$ and $\bar{h h_{j}}$ and $\bar{h h_{k}}$
$P_{i} \bar{H_{j} H_{k}}$	PTC_i and $\bar{{HH}_{j}}$ and $\bar{{HH}_{k}}$
P_iH_j	PTC_i and HH_j
W_iS_j	WG_i and SLP_j

The state of each composite node is determined from the logical function giving its relation to the state of its “parent” nodes.