Question: exosomes are of endosomal origin?
Answer: 1.1. Exosomes are a subtype of EV formed by an endosomal route and are typically 30–150 nm in diameter [1,3,4,5]. ... Early endosomes, which originate from inward budding of the cell's plasma membrane, and MVBs are involved in the endocytic and trafficking functions of the cell's material [3].