16926
The activity of MPO in the plasma was determined by spectrophotometer ; the expression of MPO mRNA was measured by employing real - time polymerase chain reaction ; DNAs were extracted from the leucocytes in blood and five SNP genotypes of MPO promoter gene detected by a multiplex genotyping method , adapter - ligation - mediated allele - specific amplification .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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