9880
The key amino acid residues in the exonuclease center of Chlamydophila pneumoniae DNApolI ( CpDNApolI ) are naturally mutated , resulting in the loss of 3 ' - 5 ' exonuclease .
 Chemical: amino acid
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: amino acid