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.
How to Serve Caviar. Caviar has been a favorite food of Middle Eastern and Eastern European royalty since the Middle Ages. Due to over-fishing of sturgeon, the fish from which the roe is taken and served as caviar, prices rose sharply at the beginning of the 20th century.