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I'm not a biologist, but I find endosymbionts fascinating. I've read about P. chromataphora, and it's fascinating to see, in some sense, a repeat of the process that gave rise to plant life.

Another fascinating (and as far as I know unique) endosymbiosis is the nitrogen-fixing bacteria in rhopalodia gibba, a diatom. I know that plenty of plants form symbioses with nitrogen-fixing bacteria, but I'm not aware of any plants whose nitrogen-fixing symbionts have taken substantial strides down the road to becoming organelles. I sometimes wonder what the agricultural possibilities would be if somebody could engineer a nitrogen-fixing endosymbiont for plants.

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