21002
Ca ( 2 + ) binding induced a large IR spectrum , with prominent amide I / II polypeptide changes , bandshifts assigned to carboxylate and an arginine , and a number of bandshifts of heme a .
 Chemical: Ca ( 2 + ); Chemical: amide; Chemical: carboxylate; Chemical: arginine; Chemical: heme a
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: Ca ( 2 + ); Chemical: amide; Chemical: carboxylate; Chemical: arginine; Chemical: heme a