[Baeocystin]

>“When we consider the sheer number of extracellular mitochondria found in the blood, we have to ask why such a discovery had not been made before,” Dr. Thierry said.

Heck of an understatement! It amazes me both how much and how little we know about life at the same time.

[1996]

Mitochondria floating in the blood is the #1 candidate explanation for why blood transfer from young to old animals can rejuvenate them, and vice-versa.