2550
Hypoxia - inducible factor - 1 ( HIF - 1 ) is one of the key mammalian transcription factors and shows increased levels in both protein stability and intrinsic transcriptional activity during low oxygen tension .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
 Entities:  
Answer:
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