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Loss - of - function effects were also observed in HIF - 1alpha - null embryonic stem cells .
 Anatomy: HIF - 1alpha - null embryonic stem cells
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: HIF - 1alpha - null embryonic stem cells