4607
Inhibitor of differentiation - 1 ( Id - 1 ) is a member of helix - loop - helix ( HLH ) family of proteins that regulate gene transcription through their inhibitory binding to basic - HLH transcription factors .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
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