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(A) Bistable regions for the rate constants 
and 
with several total concentrations of ATM. The numbers of DSBs and DSBCs are constant 
. (B) The fixed points of [ATM*] as a function of 
with 
and 
. (C) Bistable regions for 
and 
. The red points denote reversible bistability and the green points denote irreversible bistability.
