Cytomegalovirus is a viral genus of the viral group known as Herpesviridae or herpesviruses. It is typically abbreviated as CMV: The species that infects humans it is commonly known as human CMV (HCMV) or human herpesvirus-5 (HHV-5), and is the best studied of all cytomegoloviruses. Within Herpesviridae, CMV belongs to the Betaherpesvirinae subfamily, which also includes the genera Muromegalovirus and Roseolovirus. It is related to other herpesviruses within the subfamilies of Alphaherpesvirinae that includes herpes simplex viruses (HSV)-1 and -2 and varicella-zoster virus (VZV), and the Gammaherpesvirinae subfamily that includes Epstein-Barr virus. All herpesviruses share a characteristic ability to remain latent within the body over long periods. Description: Nuclear extract. Alternative Names: Cytomegalovirus protein