Guillemin, Roger C L

Guillemin, Roger C(harles) L(ouis)

(born Jan. 11, 1924, Dijon, Fr.) French-born U.S. physiologist. He and his colleagues discovered, isolated, and synthesized hypothalamic hormones that regulate thyroid activity, cause the pituitary to release growth hormone, and regulate the activities of the pituitary and the pancreas. He shared a 1977 Nobel Prize with Andrew V. Schally and Rosalyn Yalow. Guillemin is also known for his discovery of endorphins.