Perturbation of cell cycle components by p53a and NF-κBn. Diagrams illustrate the quantitative influence of external oscillatory networks (not depicted) on cell cycle components (the nodes). White nodes are most perturbed, black nodes least (values in Additional file 1 Table S1). Arrows denote direction and nature of influence. A Perturbation by p53a. B Perturbation by NF-κBn. C Perturbation by simultaneous influence of p53a and NF-κBn.