PRTN3 and granulomatosis with polyangiitis: Due to the variability in expression levels of miR-941, KDM6B mRNA, and PRTN3 mRNA during granulopoiesis, we decided to evaluate the stage of maturation of neutrophils from GPA patients compared to healthy controls to ensure that the PMNs used for comparison of RNA expression levels were of equal maturity (Table 1).