 neurotransmitter agent - Ontology Report - Rat Genome DatabaseHuman 18686GABA agent 15434adrenergic agent 8937angiotensin I 0cholinergic drug 4599dopaminergic agent 5078excitatory amino acid agonist 1028histaminergic drug 4605neurotransmitter transporter modulator 2027opioid agent 675 