Proteins found mainly in icosahedral DNA and RNA viruses. They consist of proteins directly associated with the nucleic acid inside the NUCLEOCAPSID.

Synonyms: Protein P19, Viral, Core Proteins, Virus, Core Protein, Major, Virus Core Proteins, Major Core Protein, Influenza Virus Core Proteins, Protein, Major Core, Major Core Protein lambda 1, Viral Protein P19, Major Core Proteins, Viral, Adenovirus Core Protein VII, Proteins, Virus Core, Proteins, P30 Core, Major Core Protein sigma-2, Protein P19, Oncornaviral, Viral Core Proteins, P30 Core Proteins, 0, OVP 19, Major Core Protein sigma 2, Proteins, Viral Core, Major Core Protein lambda-1, Oncornaviral Protein P19, Core Protein lambda 2, Core Protein V, Core Proteins, P30, Core Proteins, Viral