Antibodies for detecting citrullinated histone H3 (R2 citrullination, Ab176843 and R2-8-17 citrullination, Ab5103), total histone H3 (Ab24834), NCF1, NCF2, and NCF4 were from Abcam (Cambridge, MA). Antibodies for detecting PAD4 (MABE254) and citrullination (F95) were from EMD Millipore (Billerica, MA). Antibodies for PAD IP were developed as previously described40 (link). Recombinant human PAD2 and recombinant human PAD4 were generated in-house. Recombinant human histone H3, pan PAD inhibitor BB-Cl-amidine, and PAD4 inhibitor GSK484 were from Cayman Chemicals (Ann Arbor, MI). The cell fraction isolation kit was from Cell Signaling (Danvers, MA). Protein G beads, DPI, ionomycin, PMA, Hoechst 33342, HRP-labeled anti-mouse immunoglobulin G (IgG), and anti-rabbit IgG secondary antibodies were from Invitrogen (Carlsbad, CA).
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