363
The effects on reflex latencies but not on paCO2 or pHa were blocked by naloxone ( 2 mg / kg ) , and were not present in morphine - tolerant animals .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None