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In contrast , rigid and hydrophobic phenyl linker induces dense PEG conformation that can extensively shield most domains adjacent to C - terminus ( e . g . , the antigen epitopes and proteolytic sites ) of SAK and inefficiently shield its bioactive domain .
 Chemical: phenyl; Chemical: PEG; Chemical: C
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: phenyl; Chemical: PEG; Chemical: C