13943
We further identified signal peptide peptidase - like 2a and mainly signal peptide peptidase - like 2b as being responsible for the intramembrane proteolysis of TfR1 - NTF .
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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:
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