What is "granin"

Granin could be:

• Granin, a protein family
• Daniil Granin, a novelist
• Aleksandr Leonovitch Granin, a character in Metal Gear Solid 3: Snake Eater

Granin (chromogranin and secretogranin) is a protein family of regulated secretory proteins ubiquitously found in the cores of amine and peptide hormone and neurotransmitter dense-core secretory vesicles.