Bistable two-component subnetwork reactions. The 5 two-component subnetworks that CRNT established can support bistability (abcdfhjk, abcdehjk, abcejk, adijkqw, and abefjk) are compared. All 5 subnetworks contain binding of the X1 gene by P1 and dimerization of P2 by both P1 and P2. (The basal production and degradation reactions are also common to all but are not shown explicitly.) A number of other reactions are common to various subnetworks.