15846
Those peptides expressing a drug-related , non-self epitope on one of their various HLA protein forms ( HLA-A , HLA-B , HLA-C , HLA-DM , HLA-DO , HLA-DP , HLA-DQ , or HLA-DR ) can bind to a T-cell receptor and thereby stimulate the receptor-bearing parent T cell to initiate attacks on self tissues .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None