27200
The structural hierarchy of these collagen - based biomaterials is replicated by the infiltration and condensation of fluidic polymer - stabilized silicic acid precursors within the intrafibrillar milieu of type I collagen fibrils .
 Chemical: silicic acid
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: silicic acid