In addition to these biological tools, certain naturally observed configurations of DNA (genes, promoters, enhancers, repressors) and the associated machinery itself are referred to as an expression system.
Selain alat biologis ini, konfigurasi DNA tertentu yang diamati secara alami (gen, promotor, peningkat, penekan) dan mesin yang terkait itu sendiri disebut sebagai sistem ekspresi.