Therefore, if you're planning a long journey, you should always apply for the Russian visa before you leave. It's possible to get a tourist visa support at any moment before your journey, however, you can only apply for a tourist visa not earlier than 90 days before the date of your first entry to Russia.
Serotonin is a common neuromediator in the brain. It belongs to the group of so-called biogenic amines, relatively simple chemicals that facilitate the transfer of signals between the cells of the body.
The neurological side effects of serotonin are caused by the action of serotonin on the central nervous system. All the subclass of 5 HT receptors are found in the central nervous system where they control different neurological outcomes from mood and appetite to learning and memory.