8738
We have previously demonstrated that interaction of infected thymocytes with autologous thymic epithelial cells ( TEC ) is a prerequisite for a high level of human immunodeficiency virus type 1 (HIV-1) replication in thymocytes (M.Rothe, L.Chene, M.Nugeyre, F.Barre-Sinoussi, and N.Israel, J.Virol.72:5852-5861, 1998).
 thymocytes, thymic epithelial cells, thymocytes, TEC
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, thymic epithelial cells, thymocytes, TEC