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Using type 1 diabetes patient - derived preproinsulin - specific CD8 T - cell clones recognizing either an HLA - A2 ( A * 0201 ) or HLA - A24 ( A * 2402 ) - restricted epitope ( peptide of preproinsulin [ PPI ] ( 15 - 24 ) , ALWGPDPAAA ; or PPI ( 3 - 11 ) , LWMRLLPLL ) , we assessed the use of conventional mediators of cytotoxicity in the destruction of human beta - cells in vitro compared with virus - specific cytotoxic CD8 T - cell clones .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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