Late protein which is a part of a large complex required for early virion morphogenesis. This complex participates in the formation of virosomes and the incorporation of virosomal contents into nascent immature virions. Part of a complex composed of A30, G7, F10 kinase, A15, D2, D3, and J1. Localizes in cytoplasmic virus factories and present in the virion core. Expressed in the late phase of the viral replicative cycle. Phosphorylated on serines by F10 kinase, phosphorylation state is regulated by H1 phosphatase. Undergoes proteolytic processing during morphogenesis, probably required for the transformation of immature virions (IV) into mature virions (MV). Belongs to the chordopoxvirinae G7 family.