3235
Two tyrosines ( Y113 and Y128 ) fall within an identical five amino-acid motif and are shown to be phosphorylated upon TCR ligation .
 TCR
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:
 TCR