This protein is found in a variety of baculoviruses. It is known as the F protein. Matches to this family are additionally found in some presumed transposons.

1: Identification of the lymantria dispar nucleopolyhedrovirus envelope fusion protein provides evidence for a phylogenetic division of the Baculoviridae. Pearson MN, Groten C, Rohrmann GF; J Virol. 2000;74:6126-6131. PMID:10846096