1. This event is called endosymbiosis, or "cell living inside another cell with a mutual benefit for both".

2. Photosynthesis evolved in eukaryotes by the endosymbiosis of a Cyanobacterium, the future plastid, within a heterotrophic host

3. Majority of extant Anthozoans live in this obligate endosymbiosis with members of the genus Symbiodinium (Aranda et al

4. Sally Gibbs (15) first articulated the idea that these multi-membraned, or complex, Chloroplasts were acquired indirectly, not by the classic mechanism of endosymbiosis of a cyanobacterial-like prokaryote.