1988, Lubert Stryer, Biochemistry, 3rd edition, p. 1025:Epinephrine and dopamine are two other catecholamine transmitters.
2011, Steven Pinker, The Better Angels of Our Nature, Penguin 2012, p. 746:The catecholamines are used in several motivational and emotional systems of the brain, and their concentration is regulated by proteins that break them down or recycle them.
