2234
While mutations in K - Rev that inactivate any one of these properties also blocked K - Rev - dependent nuclear RNA export , several K - Rev mutants were comparable to wild type when assayed for any of these individual activities yet nevertheless defective for RNA export .
 GENE: K - Rev; GENE: K - Rev; GENE: K - Rev mutants
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: K - Rev; GENE: K - Rev; GENE: K - Rev mutants