21252
The four groups investigated included ( i ) a blank control ( no GFs ) , ( ii ) GMP - loaded IGF - 1 alone , ( iii ) GMP - loaded IGF - 1 and gel - loaded TGF - beta 3 , and ( iv ) GMP - loaded IGF - 1 and GMP - loaded TGF - beta 3 in OPF composite hydrogels .
 Chemical: OPF
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: OPF