The photosynthetic amoeba Paulinella is an example of a second chloroplast endosymbiotic event involving a cyanobacterium.

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Paulinella is a photosynthetic amoeba that acquired its chloroplast through a second endosymbiotic event, which involved the engulfment of a cyanobacterium. This is supported by genetic and morphological evidence, which shows that the Paulinella chloroplast has a different origin than those in green algae, red algae, and plants, which were acquired through a different endosymbiotic event with a cyanobacterium.

The Photosynthetic Amoeba Paulinella Is an Example of a Second