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In these experiments, SOCS-3 associated with Jak1 and inhibited Jak1 phosphorylation , and this inhibition was markedly enhanced by the presence of IL-2 receptor beta chain ( IL-2Rbeta ).
 IL-2, SOCS-3, Jak1, Jak1, IL-2Rbeta, IL-2 receptor beta chain
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:
 IL-2, SOCS-3, Jak1, Jak1, IL-2Rbeta, IL-2 receptor beta chain