Neuron

Volume 81, Issue 1, 8 January 2014, Pages 77–90

Histidine Decarboxylase Deficiency Causes Tourette Syndrome: Parallel Findings in Humans and Mice
http://www.sciencedirect.com/science...96627313010040

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TSA News
New Findings Shed Light on the Genetics of Tourette Syndrome
http://tsa-usa.org/news/0114ToureteS...wFindings.html

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Yale News
http://news.yale.edu/2014/01/08/yale...rette-syndrome

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NINDS news article
http://www.ninds.nih.gov/news_and_ev...20Syndrome.htm

Adding on an old related post as I couldn't edit it to add on this new info...

http://neurotalk.psychcentral.com/post791641-65.html
l-Histidine Decarboxylase and Tourette's Syndrome