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1.G.17.  The Bovine Leukemia Virus Envelop Glycoprotein (BLV-Env) Family. 

This family includes envelop glycoproteins of variable sizes due to proteolytic processing.  The actual fusion peptide is 24 aas long (Apellániz et al. 2014).  It derives from gPr72 of 341 aas which is an Env protein fragment that is further degraded to the envelope glycoprotein, Env-GP of 127 aas (acc# L0R354) and then to the fusion peptide.

References associated with 1.G.17 family:

Apellaniz B., Huarte N., Largo E. and Nieva JL. (2014). The three lives of viral fusion peptides. Chem Phys Lipids. 181:40-55. 24704587