4598
This specific methylation pattern caused inactivation of the HSV tk gene , while methylation of the cytosine residues within the nucleotide sequence from + 811 to + 1309 had no effect on HSV tk gene activity .
 GENE: HSV tk gene; GENE: HSV tk gene
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: HSV tk gene, HSV tk gene 
Answer:
 GENE: HSV tk gene; GENE: HSV tk gene