CD8A and Miyoshi myopathy: After stimulating PBMCs from HLA-A*02-positive MM patients (n = 3) with the peptide corresponding to the immunodominant spike-specific CD8+ T cell epitope A*02/S269–277 (YLQRPTFLL), we compared the ex vivo frequencies of spike-specific CD8+ T cells before and after SARS-CoV-2 mRNA vaccination.