PADI4 and viral myocarditis: The PAD isozyme which was found to be most involved in viral responses via STRING analysis was PAD4, and the identified viral KEGG pathways for PAD4 via STRING are highlighted in Figure 8A. The viral pathways identified included Hepatitis C, HTLV-I, Epstein–Barr virus, Herpes simplex, Hepatitis B, papilloma virus, Influenza A, Kaposi’s sarcoma-associated herpes virus infection (KSHV), viral carcinogenesis and viral myocarditis (Figure 8A).