10849
Sequential cleavage by metallopeptidases and proteasomes is involved in processing HIV - 1 ENV epitope for endogenous MHC class I antigen presentation .
 GENE: metallopeptidases; GENE: HIV - 1 ENV epitope; GENE: MHC class I antigen
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: metallopeptidases, HIV - 1 ENV epitope, MHC class I antigen 
Answer:
 GENE: metallopeptidases; GENE: HIV - 1 ENV epitope; GENE: MHC class I antigen