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.
Other types of caviar can be more or less salted. Although things have changed over the years, one thing still remains true: the salt. A special kind of salt was - and is- used to prepare caviar, a chlorine-free salt from the Russian Astrakhan Steppe, stored for seven years to assure the least chlorine content.