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Furthermore, the SH2-deleted Grf40 mutant led to a marked inhibition of these regulatory activities, the effect of which is apparently stronger than that of the SH2-deleted Grb2 mutant .
 SH2-deleted Grb2 mutant, SH2-deleted Grf40 mutant, Grb2, Grf40
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:
 SH2-deleted Grb2 mutant, SH2-deleted Grf40 mutant, Grb2, Grf40