20997
Structural Changes in Cytochrome c Oxidase Induced by Binding of Sodium and Calcium Ions : An ATR - FTIR Study .
 Chemical: Sodium; Chemical: Calcium
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: Sodium; Chemical: Calcium