MX1 and myeloproliferative neoplasm: It is well documented that NrasG12D/G12D; Mx1‐Cre+ mice exhibit progressive CMML‐like MPN in blood after pI‐pC induction.[26, 35, 36] Therefore, we monitored PB samples by conducting complete blood count (CBC) analyses every four weeks for 16 weeks post pI‐pC treatment.