1875
Only one of the sulfhydryl groups from Cys - 32 and Cys - 35 in the active center of native Escherichia coli thioredoxin - ( SH ) 2 was alkylated by excess iodoacetic acid at pH values below 8 . 0 .
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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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