18747
Sera from rabbits primed with b121a or b122a protein fragments and boosted with full - length gp120 showed broad neutralizing activity in a TZM - bl assay against a 16 - virus panel that included nine Tier 2 and 3 viruses as well as in a five - virus panel previously designed to screen for broad neutralization .
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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