From KPBS:
By allowing scientists to study her vision and her genetics, Antico learned it's possible she's seeing colors most people can't. … "She has a normal form on one X chromosome and this variant on the second X chromosome," said Kimberly Jameson, a researcher at UC Irvine who's been studying Antico's color vision.

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http://www.kpbs.org/news/2014/dec/15/san-diego-artist-could-be-seeing-extra-dimension-c/