1459
In the unit housing of a compact cyclotron and positron emission CT ( PET ) , positron emitting gas such as 15O , 11C , C15O2 , C15O etc . is supplied from a cyclotron to a PET room through a transportation pipe with an appropriate shield to reduce positron annihilation radiation .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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