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.
Salmon roe (left) and sturgeon caviar (right) served with mother of pearl caviar spoons to avoid tainting the taste of the caviar. The rarest and costliest caviar comes from the critically endangered beluga sturgeon that swims in the Caspian Sea. Caviar (Persian: Ø®Ø§ÙÛØ§Ø±â, translit.