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Fructokinase activity is elevated up to twofold when Z . mobilis was grown on fructose instead of glucose , and there was a parallel increase in frk mRNA levels .
 GENE: Fructokinase; GENE: frk mRNA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: Fructokinase; GENE: frk mRNA