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Thomas S. Kilduff is a neuroscientist and the director of SRI International 's Center for Neuroscience and Metabolic Diseases , and specializes in neurobiology related to sleep , and was involved in the discovery of hipocretin ( also known as orexin ) , a neuropeptide system that is highly involved in wakefulness regulation .
 SRI International
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 SRI International