Well, the idea is: when inserting the lux operon into chloroplasts, adding the antitoxin (stays in chloroplast) and the toxin (secreted into the cytoplasm)
The toxin shall then invade other chloroplasts and kill the non-transformed ones.
It may be good like this: A chloroplast export peptide, which is cut of then, and downstream of it there is a chloroplast import signal which then makes it enter chloroplasts again.
Or would it work even without signaling peptides? Would some of the toxin make it out of the chloroplast (it has a double membrane around!) into the cytosol, just to enter another chloroplast?
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