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Our results suggest that Syk , in contrast to Zap , can transduce signals from the T cell antigen receptor independently of Lck .
 Zap, Lck, T cell antigen receptor, Syk
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:
 Zap, Lck, T cell antigen receptor, Syk