CD8A and COVID-19–associated multisystem inflammatory syndrome in children: We stimulated peripheral blood mononuclear cells (PBMCs) from three patients with MIS-C and three at-risk controls with peptides from either the SNX8 similarity region (MQMPQGNPL) or the MADS similarity region (LQLPQGITL) for 7 days to enrich for CD8+ T cells reactive to these epitopes.