2854
Importantly , these cortical changes occurred without significant increases in body weight , with NPY ( - / - ) ob / ob mice showing significantly reduced adiposity compared to ob / ob controls , most likely due to the reduced respiratory exchange ratio seen in these animals .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None