898081 EAr arylated enzyme intermediate 1 898080 EAr early arousal 1 898079 EAr energetic neutral argon 1 898078 EAr exchange of the tetrel 1 898077 EAr expulsion of chloride ion to form an arylated enzyme intermediate 1 898076 EAr expulsion to form arylated enzyme 1 898075 EAr expulsion which forms the arylated intermediate 1