7474
Similarity is most striking in the zinc knuckle region , a region characteristic of gag genes of most replication - competent retroelements .
 GENE: gag genes
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: gag genes 
Answer:
 GENE: gag genes