Common Adjective Collocations of neurotransmitters

acetylcholine, acid, autonomic, basal, brain, calcium, central, certain, chemical, classical, extracellular, free, hepatic, human, important, mammalian, much, nervous, other, peptide, present, putative, spinal, such, sympathetic, synaptic, monoamine, neuronal, noradrenaline, norepinephrine