803
Bone marrow macrophages ( BMMs ) share common progenitors with osteoclasts and are critical components of bone - tumor microenvironment ; however , their function in prostate tumor growth in the skeleton has not been explored .
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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