7785
Expression of GrpL is restricted to hematopoietic tissues , and it is distinguished from Grb2 by having a proline -rich region .
 Grb2, proline -rich region, GrpL
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:
 Grb2, proline -rich region, GrpL