Robust corals synthesize histidine themselves, and do not depend on symbiotic algae for this essential amino acid
Some corals likely to resist bleaching - life short science news

Corals known as « robust corals » are more likely to survive bleaching than other corals, owing to their ability to synthesize an essential amino acid (histidine) themselves, a new study found. Robust corals are the only animals known to synthesize histidine, needed for the production of proteins, and not to depend for this on the algae they live with. In other corals, algae are the only source of histidine, and therefore depend on them for their survival. Therefore, unlike robust corals, the other corals (called complex corals), are more susceptible to coral bleaching (when algae disappear from the corals) and global warming.

Read the full story: Arc Centre of Excellence - Coral Reef Studie
Scientific publication: Genome Biology