Detection of and leu-enkephalin in the brain of the hagfish, Eptatretus stouti, and the lamprey, Petromyzon marinus. Dores, R. M. & Gorbman, A. General and Comparative Endocrinology, 77(3):489–499, March, 1990.
Detection of and leu-enkephalin in the brain of the hagfish, Eptatretus stouti, and the lamprey, Petromyzon marinus [link]Paper  doi  bibtex   
@article{dores_detection_1990,
	title = {Detection of and leu-enkephalin in the brain of the hagfish, {Eptatretus} stouti, and the lamprey, {Petromyzon} marinus},
	volume = {77},
	issn = {00166480},
	url = {http://linkinghub.elsevier.com/retrieve/pii/001664809090241D},
	doi = {10.1016/0016-6480(90)90241-D},
	language = {en},
	number = {3},
	urldate = {2016-06-07},
	journal = {General and Comparative Endocrinology},
	author = {Dores, Robert M. and Gorbman, Aubrey},
	month = mar,
	year = {1990},
	keywords = {Eptatretus stoutii, Petromyzon marinus},
	pages = {489--499},
}

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