(A) Representative immunofluorescence stainings of neutrophil elastase (red), histone (green) and DNA (blue) in human neutrophil cultures stimulated with media only, C5a, IFN-β and C5a + IFN-β for 4h. 20×. (B) Quantification of mean number of neutrophil extracellular traps (NETs) in neutrophil cultures of four healthy controls stimulated with media only, C5a, IFN-β and C5a + IFN-β. p-value from a two-tailed Student’s t-test is shown.