A new study in the American Journal of Human Genetics has performed the first whole-genome linkage scan for synesthesia, which is known to run in families and to affect women more than it does men. Researchers found four candidate regions on chromosomes 2q24, 5q33, 6p12, and 12p12, and revealed that the disease, in which sounds are perceived as colors, is not X-linked as was previously thought.

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