This family groups together the viral proteins BLRF1, U46, 53, and UL73. The UL73-like envelope glycoproteins, which associates in a high molecular mass complex with its counterpart, gM, induce neutralising antibody responses in the host. These glycoprotein are highly polymorphic, particularly in the N-terminal region [1].

1: gpUL73 (gN) genomic variants of human cytomegalovirus isolates are clustered into four distinct genotypes. Pignatelli S, Dal Monte P, Landini MP; J Gen Virol 2001;82:2777-2784. PMID:11602789