For the example system RKIP-ERK pathway (Kwang-Hyun et al., 2003), results highlighted a specific region of behavior space (with low RKIP and high ERK activation levels) that seems to be particularly robust, i.e., consistently reached by the GRN from certain initial conditions, and that might be associated with tumor development (Lee et al., 2006). Here, PEBP1 is linked to neoplasm.