8176
The thymus contained small numbers of thymocytes , and TUNEL staining showed that higher population of thymocytes were undergoing apoptosis .
 thymocytes, thymocytes
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:
 thymocytes, thymocytes