5791
The spleen and peripheral blood monocyte progenitors share phenotypic markers with bone marrow progenitors but differ in their expression of CD11b , which was low in bone marrow but high in periphery .
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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:
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