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The record for storing antiparticles is currently held by the TRAP experiment at CERN : antiprotons were kept in a Penning trap for 405 days .
 CERN, Penning trap
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 CERN, Penning trap