<prompt> Which of the following is not a myeloproliferative neoplasm?Polycythemia veraJuvenile myelomonocytic leukemiaChronic myeloid leukemiaEssential thrombocythemia  <response>: Juvenile myelomonocytic leukemia is not included in the category of MPNs myeloproliferative neoplasms in WHO classification Examples of myeloproliferative neoplasms: Chronic myeloid leukemia Polycythemia vera Primary myelofibrosis Essential thrombocythemia Chronic eosinophilic leukemia Activating JAK2 mutations are seen in: Nearly all cases of polycythemia vera Approx. 50 of cases of primary myelofibrosis and essential thrombocythemia BCR-ABL1 translocation seen in CML 