YTHDF1 and neoplasm: When we established subcutaneous xenograft models with these cells in immunodeficient non‐obese diabetic severe combined immunodeficiency gamma (NSG) mice, Ythdf1 depletion resulted in a moderate retardation in tumor growth (Figure S10A–C, Supporting Information), suggesting that Ythdf1 depletion impedes the growth of cancer cells, irrespective of host immunity in mouse xenograft models.