I found one publication detected CD9, CD63, and CD81 via western blot. I feel a little confused about it. The antibody they used are specific for human, mouse (I checked the product in the official website), or pig and does it also specific on fruits? Otherwise, CD family do they also expressed in fruits? If yes, why most of other publications used other markers like TET?
Grapefruit-derived extracellular vesicles as a promising cell-free therapeutic tool for wound healing - Food & Function (RSC Publishing)
Altought i didn't know about this until i read your question, i think that yes there are tetraspanin like markers in plants (alias TET), but not the CD markers we known in humans.
Some of these have structural similarity with the human ones, and that is why the antibody work. In the paper, probably dont known the right TET maker that is detected and they use the common term.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6512927/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4634101/
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