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Endocrine cells were studied by means of Grimelius ' silver staining and immunostaining for chromogranin , a general marker of endocrine cells .
 GENE: chromogranin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: chromogranin