15603
MDS are due to defects in mtDNA maintenance caused by mutations in nuclear genes that function in either mitochondrial nucleotide synthesis ( TK2 , SUCLA2 , SUCLG1 , RRM2B , DGUOK , and TYMP ) or mtDNA replication ( POLG and C10orf2 ) .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None