The construction of gene networks proves to be a noisy process, and one difficult to produce a deterministic result. Many labs have tried to characterize sources of expression noise that occur when linking genes together in a network. More specifically, what effect does a noisy or tightly controlled input have on output. Discovering the effects of noise propagation of in genetic cascades has major implications in the field of synthetic biology. From an engineering standpoint, the degree of control over a synthetic system can mean the difference between a synthetic construct's sucess or failure to achieve its purpose (ex. medical applications).