19890
Areas covered : Carbonic anhydrases ( EC 4 . 2 . 1 . 1 ) are ubiquitous metalloenzymes that catalyze the reversible hydration / dehydration of CO2 / HCO3 ( - ) , respectively .
 Chemical: CO2; Chemical: HCO3 ( - )
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: CO2; Chemical: HCO3 ( - )