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Table 1 Feasible logical parameters (K) generating bi-stable cyclic attractors along with their equivalent logical equations (see [63] for more details on how these equations might be further simplified)

From: High-fidelity discrete modeling of the HPA axis: a study of regulatory plasticity in biology

Component

Logical values(Kinetic Ratios)

Logical Equivalence

CRH (i=2)

K2∅=0, K24=1

CRH::(CORT⇔0).

ACTH (i=3)

K3∅=0, K32=1, K35=1, K3.25=1

ACTH::(CRH AND ¬(R⇔0)) OR (¬CRH ANDR⇔0) OR(CRH ANDR⇔0).

CORT (i=4)

K4∅=0, K43=2

CORT⇔2::ACTH.

R (i=5)

K5∅=0, K54=1, K55=2, K5.45=2

R⇔2::(R⇔2)OR(R⇔2 AND CORT⇔2).R⇔1::CORT⇔2AND ¬(R⇔2).

  1. Note that Stress is not mentioned in this table since it has no input interaction. The binary entities (e.g. CRH and ACTH) are denoted by conventional logical notations (e.g. ¬ACTH::ACTH⇔0)