4477
In the intact animal , postextrasystolic potentiation depended on the basic pacing interval , t0 , and the timing of the extrasystole , t1 : when t0 was held constant and t1 was increased , potentiation decreased ; when t1 was held constant and t0 was increased , potentiation increased .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None