3695
It is noteworthy that under more physiological conditions mimicking the cellular GDP / GTP ratio , Raf enhances the GEF - stimulated GDP / GTP exchange on Ha - Ras , in agreement with the sequestration of Ras . GTP by Raf .
 GENE: Raf; GENE: GEF; GENE: Ha - Ras; GENE: Ras . GTP; GENE: Raf
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: Raf; GENE: GEF; GENE: Ha - Ras; GENE: Ras . GTP; GENE: Raf