8788
Substitution of bulky hydrophobic residues with charged residues within PEP1 affects the fusion activity of the S protein without affecting processing and surface expression .
 GENE: PEP1; GENE: S protein
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: PEP1, S protein 
Answer:
 GENE: PEP1; GENE: S protein