1681
We have used mutation - directed chemical cross - linking with bis ( sulfosuccinimidyl ) suberate ( BS3 ) to investigate the architecture of the gp41 oligomer .
 GENE: gp41 oligomer
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: gp41 oligomer