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A MEDLINE search of the English-language literature was conducted using the indexing terms ' immunology , calcitriol and vitamin D ' to identify studies indicating a role for calcitriol as a primary immunomodulator .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
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