2149
The codon usage is particularly marked for the gag , pol , and env genes .
 GENE: gag; GENE: pol; GENE: env genes
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: gag; GENE: pol; GENE: env genes