1590
Previous studies have demonstrated that IL-1 receptor ( IL-1R )- and TCR -initiated signals can interact synergistically to increase the rate of transcription of several lymphokine and lymphokine receptor genes during the competence phase of the activation program in T helper lymphocytes .
 T helper lymphocytes, TCR, IL-1 receptor, IL-1R
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:
 T helper lymphocytes, TCR, IL-1 receptor, IL-1R