108
It contains a number of structural motifs , including Src homology 2 , Src homology 3 , and pleckstrin homology domains and a putative guanine nucleotide exchange domain .
 ( protein: structural motifs, None) , ( protein: Src homology 2 , Src homology 3 , and pleckstrin homology domains, None) , ( protein: Src homology 2, None) , ( protein: pleckstrin homology domains, None) , ( protein: Src homology 3, None) , ( protein: putative guanine nucleotide exchange domain, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: structural motifs, None) , ( protein: Src homology 2 , Src homology 3 , and pleckstrin homology domains, None) , ( protein: Src homology 2, None) , ( protein: pleckstrin homology domains, None) , ( protein: Src homology 3, None) , ( protein: putative guanine nucleotide exchange domain, None) 