Szukana fraza: [Abstract = "A framework for including unknown processes activating gene transcription by means of first\-order lag elements is introduced and discussed. Then, a particular interferon\-\? induced pathway is introduced, limited to early events that precede activation of gene transcription. It is shown how to simplify the system description based on the goals of modeling. Further, a computational analysis is presented, facilitating better understanding of the mechanisms underlying regulation of key components in the pathway. The analysis is illustrated by a comparison of simulation and experimental data."]