1894
Several mutations disrupted the endonuclease and helicase activities ; however , only one amino - terminal - charge cluster mutant protein ( D40A - D42A - D44A ) completely lost AAV hairpin DNA binding activity .
 GENE: helicase; GENE: amino - terminal - charge cluster mutant protein
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: helicase; GENE: amino - terminal - charge cluster mutant protein