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Both viruses and tumors evade cytotoxic T lymphocyte-mediated host immunity by down-regulation of antigen presentation machineries. This can be achieved by either down-regulation of transcription of antigen presentation genes or posttranslational inactivation of proteins involved in antigen presentation. In this study, a major histocompatibility complex (MHC) class I-deficient melanoma cell line, SK-MEL-19, was found deficient in the expression of the transporter associated with antigendoi:10.1074/jbc.m300954200 pmid:12582163 fatcat:vgddpwbf6rb27atvanp2afsvdi