Det aktive stof i Enbrel, etanercept, er et protein, der er opbygget, så det blokerer den biologiske virkning af et af kroppens kemiske signalstoffer, der kaldes tumornekrosefaktor (TNF).
The active substance in Enbrel, etanercept, is a protein that has been designed to block the activity of a chemical messenger in the body called tumour necrosis factor (TNF).