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In contrast to previous results obtained using polyclonal antiseras to detect Pan/ E2A proteins , we report comparable levels of Pan proteins in GH/PRL- and insulin- producing , B- and T- lymphocyte cells .
 Pan proteins, E2A proteins
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 Pan proteins, E2A proteins