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The evolution of phototrophic bacteria and photosynthesis in general is certainly an interesting but complex topic. It is commonly well accepted that anoxygenic phototrophy evolved well before the gradual oxygenation of the Earth. This means that the photosynthetic machinery of anaerobic phototrophic bacteria (like purple and green bacteria) evolved well before the existence of oxygenic photosynthesis of algae and plants. One of the best studied model organisms for studying photosynthesis in purple… Read More