29650
Four different cell types , human mesenchymal stem cells ( hMSC ) , fibroblasts ( L929 ) , preosteoblasts ( MC3T3 ) , and canine mesenchymal stem cells ( cMSC ) , were used to evaluate the cytotoxicity of PPF .
 Chemical: PPF
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: PPF