2421
Mss4 also acts as a relatively inefficient guanine nucleotide exchange factor ( GEF ) .
 GENE: Mss4; GENE: guanine nucleotide exchange factor; GENE: GEF
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: Mss4; GENE: guanine nucleotide exchange factor; GENE: GEF