9987
On the other hand , when the valine residue was replaced by an alanine residue , an increase of the binding affinity and the amount of block by apamin was observed for alanine mutated SK2 channels , but not for mutated SK3 channels .
 Chemical: valine; Chemical: alanine; Chemical: alanine
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: valine; Chemical: alanine; Chemical: alanine