1650
The induction of AP1 by okadaic acid suggests that protein phosphatases 1 and 2A ( PP1 and PP2A ) may be involved in T cell activation as important negative regulators of the transcription factor AP1 .
 protein: transcription factor; protein: PP2A; protein: AP1; protein: PP1; protein: AP1
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: transcription factor; protein: PP2A; protein: AP1; protein: PP1; protein: AP1