Brain

Pinealon (Glu-Asp-Arg) is a tripeptide directed at brain tissue despite its name. Epitalon is the pineal tetrapeptide. They are different molecules with different assigned tissue.

Cortexin is an extract preparation used clinically in Russia. It is not the same class of thing as a three-amino-acid synthetic.

Chapter in progress: we are still reading the English-language literature on cognitive endpoints.