Fig. 6.

For genetic toggle switch model, MATLAB graph of root‐loci for

${\alpha }_2^2$

parameter; two branches start at pure imaginary poles and lie on the left half plane always which yield two complex conjugate poles with negative real parts, two branches start from pure imaginary poles and one of them ends at origin and the other one goes to complex zero at infinity, the last branch starts from a positive real pole and tends to a complex zero at infinity after leaving the break‐away point