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However , to date the expression of Nrp2 in bone has not been investigated and a possible role for Nrp2 in the maintenance of bone homeostasis in vivo remains unexplored .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None