18744
b12 , one of the few broadly neutralizing antibodies against HIV - 1 , binds to the CD4 binding site ( CD4bs ) on the gp120 subunit of HIV - 1 Env .
 None
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