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.
Therefore, by a number of properties the first place belongs to keta's caviar, which is orange with a glimpse of red. Next goes light orange caviar of pink salmon and caviar of red salmon with almost maroon large grains; such caviar is especially popular in Europe, while here keta's caviar is preferred.