Robustness of time dependent responses in a cell population against variations at the single cell levels has been observed in several systems, e.g., oscillations in adenosine 3′,5′ cyclic monophosphate (cAMP) concentrations in a population of Dyctostelium[52], [53], or damped oscillations of protein 53 (p53) in a population of human breast cancer epithelial cells [54]. The gene discussed is TP53; the disease is breast carcinoma.