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.
Caviar refers to the salted eggs (roe) of the fish species, sturgeon. 1  Caviar comes from the Persian word Khaviar which means bearing eggs. Some eggs from other species ( such as salmon, paddlefish, whitefish, and lumpfish) may be labeled caviar if the name of the fish is included. The three main types of caviar beluga, sevruga, and osetra, refer to the sturgeon species the caviar comes from. Beluga, the largest eggs, comes from the species Huso huso.