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To investigate the inhibitory mechanisms, we constructed a secreted-type placental alkaline phosphatase ( PLAP ) reporter gene whose transcription is controlled by a 1.4-kb human TNF-alpha promoter .
 placental alkaline phosphatase, secreted-type placental alkaline phosphatase ( PLAP ) reporter gene, 1.4-kb human TNF-alpha promoter, PLAP
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:
 placental alkaline phosphatase, secreted-type placental alkaline phosphatase ( PLAP ) reporter gene, 1.4-kb human TNF-alpha promoter, PLAP