19883
The results reveal that PCL / beta - TCP / collagen scaffold provide much broader cell attachment sites than PCL / beta - TCP scaffold .
 Chemical: PCL; Chemical: beta - TCP; Chemical: PCL; Chemical: beta - TCP
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: PCL; Chemical: beta - TCP; Chemical: PCL; Chemical: beta - TCP