А если еще и в кавычках загуглить, то думаю, Maxxicum прав насчет гормонального каскада: "There is typically a three hormone sequence involving the anterior pituitary. 1. A hormone produced and released from hypothalamus into portal vessels. 2. This signals release of a hormone from the anterior pituitary. 3. This hormone goes through the circulation and acts on a target organ in the body which releases a hormone. Remember: 3 tissue sites - 3 hormones." http://ttb.eng.wayne.edu/~cavanau/bme5010/f2000/hormone1.html Но это без контекста от аскера...
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