1606
The used expression system could allow to produce mutated forms of SsEF - 2 obtained by mutagenesis of the corresponding gene .
 GENE: SsEF - 2
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: SsEF - 2