has primary input binding cation binding norepinephrine binding noradrenaline binding Binding to norepinephrine, (3,4-dihydroxyphenyl-2-aminoethanol), a hormone secreted by the adrenal medulla and a neurotransmitter in the sympathetic peripheral nervous system and in some tracts of the CNS. It is also the biosynthetic precursor of epinephrine. molecular_function GO:0051380 catecholamine binding