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.
Lumpfish caviar is one of the less costly types of caviar, a delicacy made of salted fish eggs. The lumpfish is a thick-skinned, lumpy cold-water fish found mostly in the North Pacific, but also in the North Atlantic and Arctic oceans. Fish eggs, called roe, have important nutrients. The caviar made from roe retains many nutrients. However, like all caviar, lumpfish is high in sodium and cholesterol.