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In contrast, when RBTN-2 is inappropriately expressed in T cells , RBTN-2 would interact predominantly with elf-2b ; this interaction may lead to T cell proliferation .
 T cells, RBTN-2, RBTN-2, elf-2b
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:
 T cells, RBTN-2, RBTN-2, elf-2b