457
Here we have therefore examined the effect of the phorbol ester PMA ( phorbol 12-myristate 13-acetate ) which stimulates PKC and a combination of the adenosine receptor agonist NECA ( 5'-(N-ethyl)-carboxamido adenosine ) and forskolin to raise cAMP , on the levels of c-Fos and Jun and on the binding and transcriptional activity of the transcription factor , activator protein-1 ( AP-1 ).
 protein: adenosine receptor; protein: activator protein-1; protein: Jun; protein: PKC; protein: AP-1; protein: c-Fos; protein: transcription factor
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: adenosine receptor; protein: activator protein-1; protein: Jun; protein: PKC; protein: AP-1; protein: c-Fos; protein: transcription factor