11131
Analysis of Scl ( Delta 40 / Delta 40 ) embryonic stem ( ES ) cells revealed impaired erythroid differentiation , which was accompanied by a failure to upregulate Scl when erythropoiesis was initiated .
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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