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1.G.16 The Human Immunodeficiency Virus Type 1 (HIV-1) Fusion Peptide (HIV-FP) Family 

The HIV-FP family consists of an N-terminal segment of the envelop protein, Env.  Although the fusion peptide is only 20 aas in length with a single N-terminal TMS, the 68 aa peptide including this segment is 68 aas in length (Apellániz et al. 2014).  Pfam/CDD calls this family the Ebola_HIV1-like HR1-HR2 Superfamily.

References associated with 1.G.16 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