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To examine the effect of Trx in intact cells, we performed transient assay with a chloramphenicol acetyltransferase -expressing plasmid under the control of human immunodeficiency virus (HIV) long terminal repeat and an effector plasmid expressing human Trx .
 Trx, chloramphenicol acetyltransferase, human immunodeficiency virus (HIV) long terminal repeat, effector plasmid, chloramphenicol acetyltransferase -expressing plasmid, human Trx
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:
 Trx, chloramphenicol acetyltransferase, human immunodeficiency virus (HIV) long terminal repeat, effector plasmid, chloramphenicol acetyltransferase -expressing plasmid, human Trx