2775
These findings underline the importance of using nanostructured SH surfaces for directing 3D neuronal growth , as well as for the design of biomaterials for neuronal regeneration .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None