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In 2014 , researchers demonstrated the immunomodulatory potential of DMT and 5-MeO - DMT through the Sigma-1 receptor of human immune cells .
 location: Sigma-1
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Sigma-1 
Answer:
 location: Sigma-1