20998
Attenuated total reflection Fourier transform infrared ( ATR - FTIR ) spectroscopy was used to investigate the binding of Na ( + ) and Ca ( 2 + ) cations to bovine cytochrome c oxidase in its fully oxidized and partially reduced , cyanide - ligated ( a ( 2 + ) a3 ( 3 + ) - CN ) ( mixed valence ) forms .
 Chemical: Na ( + ); Chemical: Ca ( 2 + ); Chemical: cyanide; Chemical: CN
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: Na ( + ); Chemical: Ca ( 2 + ); Chemical: cyanide; Chemical: CN