3337
4 ) Mutation of the three extracellular cysteine residues of GFKAR beta indicated that the two conserved cysteine residues ( C305 and C385 ) , located between two transmembrane segments , form a solvent - accessible disulfide bond .
 GENE: GFKAR beta
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: GFKAR beta