IALYLQQNW is a specific nonapeptide sequence derived from the Epstein-Barr virus (EBV) encoded tumor-associated latent membrane protein 1 (LMP1). As a potential T-cell epitope, IALYLQQNW has the ability to activate EBV-specific cytotoxic T lymphocytes (CTLs), which can recognize and eliminate EBV-infected cells expressing LMP1. This peptide plays a vital role in the immune response against EBV-associated tumors and is utilized in research on Hodgkins disease and nasopharyngeal carcinoma.