- High frequency of the JAK2 V617F mutation in patients with thrombocytosis (platelet count > 600 x 109/L) and ringed sideroblasts more than 15% considered as MDS/MPD, unclassifiable. Gattermann, N., Billiet, J., Kronenwett, R., Zipperer, E., Germing, U., Nollet, F., Criel, A., Selleslag, D. Blood (2007)