Falck-Hillarp method of fluorescence
The Falck-Hillarp method of fluorescence ( the F-H method ) is a technique that makes it possible to demonstrate and study , with unique precision and susceptibility , certain monoamines , among those the three catecholamines dopamine , noradrenaline , and adrenaline , as well as serotonin and related substances . 
<triplet> dopamine <subj> catecholamine <obj> subclass of <triplet> noradrenaline <subj> catecholamine <obj> subclass of