5681
In all five mutants , expression of nitrate reductase genes was increased and of nitrite reductase decreased , suggesting an impaired aerobic respiration .
 Chemical: nitrate; Chemical: nitrite
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: nitrate; Chemical: nitrite