18745
Two small fragments of HIV - 1 gp120 , b121a and b122a , which display about 70 % of the b12 epitope and include solubility - enhancing mutations , were designed .
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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:
 None