Baculoviruses are distinct from other virus families in that there are two viral phenotypes: budded virus (BV) and occlusion-derived virus (ODV). BVs disseminate viral infection throughout the tissues of the host and ODVs transmit baculovirus between insect hosts. GFP tagging experiments implicate p74 as an ODV envelope protein [1,2].

1: Identification of p74, a gene essential for virulence of baculovirus occlusion bodies. Kuzio J, Jaques R, Faulkner P; Virology 1989;173:759-763. PMID:2688302

2: A study of the Autographa californica multiple nucleopolyhedrovirus ODV envelope protein p74 using a GFP tag. Slack JM, Dougherty EM, Lawrence SD; J Gen Virol 2001;82:2279-2287. PMID:11514740