The model by Bentele et al. and results of its reduction. A. The original model decomposed into modules according to three steps of apoptosis: activation of caspases-8 and -9 and inactivation of PARP. The species retained after the model reduction are colored. B. The modular view of the model. The dashed connections were deleted during the model reduction. C. The minimal reduced model. D. The graphical notation used for representation of the models A-C.