1758
This action could be antagonized by aminophylline , a competitive antagonist on P1 purinoceptors .
 GENE: P1 purinoceptors
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: P1 purinoceptors