Briefly, plasma or supernatant from neutrophils culture was incubated overnight in a plate precoated with anti-MPO antibody (Thermo Fisher Scientific; cat. PA5-16672). The DNA bound to MPO was quantified using the Quant-iT PicoGreen kit (Invitrogen; cat. P11496), as described (Colón et al., 2019 (link); Czaikoski et al., 2016 (link)).