The digestion of NETs in paraffin section with external DNase was conducted as described previously (15 (link)). Briefly, the digestion was conducted in one slide for 30 minutes at 37°C. A serial cut of the paraffin section was handled and stained in parallel without adding DNase. Samples were recorded using a Leica TCS SP5 AOBS confocal inverted-base fluorescence microscope with an HCX PL APO ×40 0.75–1.25 oil immersion objective The settings were adjusted using isotype control antibodies in separate preparations. Stitched images were combined using Adobe Photoshop CS6.
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