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Although photosynthesis by algae is a key part of the symbiotic relationship it is not required to initiate symbiosis. The discovery adds to the little-understood relationship between cnidarians and algae at the molecular level and offers insight into how to jump start the symbiotic relationship between the two organisms after a bleaching event. It could also lead to strategies that might prevent warmer oceans from breaking the symbiotic relationship between the two organisms and saving what remains of the world’s corals.