1003
These results provide strong evidence that conserved interhelical packing interactions in the gp41 core are important determinants of HIV - 1 entry and its inhibition .
 GENE: gp41 core
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 core