25934
Co - culture of POBs with M - CSF - expanded bone marrow macrophages ( BMMs ) showed that the inhibition of PTH - stimulated OB differentiation required not only COX - 2 or PGE2 but also BMMs .
 Chemical: PGE2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: PGE2