13250
The p56 Src family non-receptor tyrosine kinase has been shown to be critical for T lymphocyte differentiation and activation .
 p56 Src family non-receptor tyrosine kinase
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:
 p56 Src family non-receptor tyrosine kinase