20281
Short peptide toxins isolated from scorpion venoms are able to block voltage - dependent or Ca ( 2 + ) - activated K ( + ) channels .
 Chemical: Ca ( 2 + ); 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: Ca ( 2 + ); Chemical: K ( + )