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This partial inhibition is consistent with numerous previous reports demonstrating a central role for an IL - 12 / IFN - gamma positive feedback loop active between NK cells and IL - 12 - producing cells ( 15 - 17 ) .
 Anatomy: NK cells; Anatomy: IL - 12 - producing cells
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
 Entities: NK cells, IL - 12 - producing cells 
Answer:
 Anatomy: NK cells; Anatomy: IL - 12 - producing cells