15896
Combination of alpha - 1 and muscarinic antagonists suppressed K ( + ) depolarization - induced contraction potently in ventral rings , but slightly in anterior rings .
 Chemical: K ( + )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: K ( + )