1877
However , mutant mice display increased regions of nonmineralized , Ibsp - expressing osteoblasts in the periosteum during embryonic development and increased areas of uncalcified osteoid postnatally .
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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