Studies have demonstrated microglia and astrocytes are key contributors to the neuroinflammatory environment and progression of MS (Lassmann, 2019; Ponath et al., 2018b; Voet et al., 2019), and we confirmed RIPK1 expression in microglia and astrocytes from post-mortem progressive MS samples. The gene discussed is RIPK1; the disease is myeloid sarcoma.