The JAK2V617Fpos cell line HEL has a low expression of CCR2 (% positive cells: 10.34 ± 2.10), with values that are intermediate between the PMF and the PV/ET group (p = n.s, Figure 3A) but significantly lower than the overtPMF subtype (p < 0.001, Figure 3B). The gene discussed is CCR2; the disease is acquired polycythemia vera.