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These are prominent enzymes in the endocytic pathway through which soluble protein Ag enter APC , and resistant segments in Ag may, therefore, be expected to contain more T-cell determinants than susceptible segments .
 protein: APC; protein: T-cell determinants; protein: enzymes; protein: susceptible segments; protein: soluble protein Ag; protein: resistant segments; protein: Ag; protein: Ag
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: APC; protein: T-cell determinants; protein: enzymes; protein: susceptible segments; protein: soluble protein Ag; protein: resistant segments; protein: Ag; protein: Ag