26020
At 4 - 6h , NRTI increased levels of ROS but decreased the activities of electron transport chain complexes I - IV , levels of ATP and the NAD / NADH ratio .
 Chemical: ATP; Chemical: NAD; Chemical: NADH
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: ATP; Chemical: NAD; Chemical: NADH