Scientists have untangled the mysteries of two of the brain's serotonin receptors, findings that they say could help in the development of drugs to fight depression, obesity or migraines. The decoded molecular structures are reported on in two studies, which scientists say can also help with the study of human consciousness. "Before this there was no crystal structure for any serotonin receptor. A lot of what was theoretical is now known with a great degree of certainty," said Bryan Roth, a co-author of the two studies published in Science.

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