As fungal pathogens sink their feeding apparatuses into host cells, plants can fight back by shooting out vesicles packed with defensive molecules.
When identifying vesicles thought to be exosomes, plant biologists look for a number of hallmark traits.
Size: 30 to 150 nanometers in diameter
Molecular markers: Membrane trafficking proteins and proteins derived from the trans-golgi network (TGN) and the multivesicular body (MVB)
Examples of known cargo:
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