Keeping your symbiosis genes on a plasmid is a smart move if you have multiple potential hosts. Here a gut bacterial symbiont, but same is true for N-fixing Rhizobia.
https://www.science.org/doi/10.1126/science.adp7748
https://www.science.org/doi/10.1126/science.adp7748
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Could be a good paper to use in my class next semester