2143
This gene , designated HPRT Tokyo , had a single nucleotide change from G to A , as identified by sequencing cDNA amplified by the polymerase chain reaction .
 None
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:  
Answer:
 None