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The existence of the antiproton was experimentally confirmed in 1955 by University of California , Berkeley physicists Emilio Segrè and Owen Chamberlain , for which they were awarded the 1959 Nobel Prize in Physics .
 University of California, Berkeley, Emilio Segrè, Owen Chamberlain
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 University of California, Berkeley, Emilio Segrè, Owen Chamberlain