14998
In vitro hematopoietic potential of LSK cells co - cultured for 7days with fresh OB or OB pre - cultured for 1 , 2 , or 3 weeks declined precipitously with increasing culture duration concomitant with loss of CD166 expression .
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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