3901
p38 and p63 may provide a docking site for Grb2 , thereby linking Grb2 SH3-binding proteins SOS1 , SLP-76 , and p120 to downstream signalling events .
 protein: SOS1; protein: Grb2 SH3-binding proteins; protein: SLP-76; protein: p38; protein: Grb2; protein: p63; protein: p120; protein: Grb2
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: SOS1, Grb2 SH3-binding proteins, SLP-76, p38, Grb2, p63, p120, Grb2 
Answer:
 protein: SOS1; protein: Grb2 SH3-binding proteins; protein: SLP-76; protein: p38; protein: Grb2; protein: p63; protein: p120; protein: Grb2