1626
The TCF - 1 alpha binding site was also required for TCR alpha enhancer activity in transcriptionally active extracts from Jurkat but not HeLa cells , confirming that TCF - 1 alpha is a T - cell - specific transcription factor .
 TCF - 1 alpha binding site, TCR alpha enhancer, TCF - 1 alpha, T - cell - specific transcription factor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 TCF - 1 alpha binding site, TCR alpha enhancer, TCF - 1 alpha, T - cell - specific transcription factor