STRUCTURE ACROSS KINGDOMS. “The majority of capsids using the HK97-fold are of viruses infecting bacteria (bacteriophage or phage). However, this fold is also found in the coat protein floor domain of eukaryotic Herpesvirdae, including Herpes simplex virus type 1 (HSV-1), murine cytomegalovirus (MCMV), pseudorabies virus (PRV), and rhesus monkey rhadinovirus (RRV), as well as the archaeal Haloarcula sinaiiensis tailed virus 1 (HSTV-1).”