1534
Quantitative backscattered electron imaging , nanoindentation , and microcrack assessments were performed on the subchondral region of both control and ischemic femoral heads from 5 piglets .
 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