ACTH is a segment of a much larger glycoprotein prohormone molecule called proopiomelanocortin (POMC). POMC is synthesized by the corticotrophs of the anterior pituitary, which constitute about 10 percent of the gland.
Caviar harvested from an older fish is the more rare, and more sought after, white caviar. The Beluga sturgeon are primarily found in the Caspian Sea, which is surrounded by Iran, Azerbaijan, Russia, Kazakhstan and Turkmenistan. The other primary source of Beluga sturgeon is the Black Sea near Russia and Romania.
Ikura (salmon roe) on a sushi roll. Red caviar is a caviar made from the roe of Pacific, Atlantic and river species of salmon. Given its high price in the West, red caviar is associated with luxury and wealth, but in Russia and Japan, caviar is commonly served at holiday feasts, weddings and other festive occasions.