2320
As a prerequisite for the identification of point mutations in the ND gene we have established the exon - intron structure of this gene .
 Disease: ND
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
 Entities: ND 
Answer:
 Disease: ND