4939
Adrenergic system activation , indicated by metanephrine / epinephrine ratio , increased with time in losing males , except that after one month of cohabitation , turnover returned to levels that equaled those of control animals .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None