Die Immunabwehr, also die Abwehr eines Krankheitserregers oder Fremdkörpers mithilfe eines präzis(e) gesteuerten Abwehrsystems, ist eine der komplexesten Reaktionen im Körper eines Lebewesens.

The part in brackets was removed, and I am to fill it. I thought it was an adjective and put "en" but it's actually an adverb. In a previous question I asked, this sort of phenomena was explained through a difference in intended semantics refer, but I can't apply the principles there here. Could someone help?

I believe the main difficulty is that here adverb comes between noun and verb in a comma sentence which makes using the reasoning in above difficulter?