16028
The enzyme ( TcCA ) has a very high catalytic activity for the CO ( 2 ) hydration reaction , being similar kinetically to the human ( h ) isoform hCA II , although it is devoid of the His64 proton shuttle .
 Chemical: CO ( 2 ); Chemical: His64
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: CO ( 2 ); Chemical: His64