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Rhodamine B is used in biology as a staining fluorescent dye , sometimes in combination with auramine O , as the auramine-rhodamine stain to demonstrate acid-fast organisms , notably " Mycobacterium " .
 location: Mycobacterium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Mycobacterium