1879
The sulfhydryl group with a pK value of 6 . 7 was shown to belong to Cys - 32 by labeling thioredoxin with [ 14C ] iodoacetic acid followed by complete alkylation with [ 3H ] iodoacetate and amino acid sequence analysis of peptides from the active center .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
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