9879
Some bacterial DNApolIs are deficient in 3 ' - 5 ' exonuclease , which is required for removing an incorrectly incorporated 3 ' - terminal nucleotide during DNA elongation by DNA polymerase activity .
 Chemical: nucleotide
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: nucleotide