concomitant release of noradrenaline ( na ) ( using tritium labelling ) , adenosine 5'-triphosphate ( atp ) ( using the luciferin-luciferase firefly technique ) and neuropeptide y ( using the enzyme-linked immunosorbant assay ) during electrical stimulation of the guinea-pig vas deferens has been demonstrated .
C0024075
luciferase
C0162328
firefly