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.
There are many different types of caviar. Therefore, there are various ways to classify caviar. These include classifying them by fish source. True caviar comes from sturgeon, while caviar alternatives come from other types of fish like paddlefish, trout, and salmon. Further, due to the environmental issues prevalent in the world, a new type of fish row has emerged: farmed caviar. These include types of caviar that come from sturgeons or from other alternative species.