72509
The vector bosons regarded as elementary particles in the Standard Model are the gauge bosons , the force carriers of fundamental interactions : the photon of electromagnetism , the W and Z bosons of the weak interaction , and the gluons of the strong interaction .
 Standard Model, Z
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Standard Model, Z