14284
ACH-2 , derived from a human T cell line ( CEM ), is chronically infected with HIV-1 , with low levels of constitutive virus expression .
 CEM, ACH-2, human T cell line
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:
 CEM, ACH-2, human T cell line