Gp41 https://en.wikipedia.org/wiki/Gp41#cite_note-:3-1 References 1 Acknowledgements The authors thank Jinal Bhiman and Jay Gorman for helpful discussions. https://journals.lww.com/co-hivandaids/Fulltext/2015/05000/HIV_broadly_neutralizing_antibody_targets.3.aspx Structure and Recognition of a Novel HIV-1 gp120-gp41 Interface Antibody that Caused MPER Exposure through Viral Escape https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5226681/ Jason Gorman Potent neutralizing antibodies against multiple epitopes on SARS-CoV-2 spike https://www.nature.com/articles/s41586-020-2571-7\ Now where did that gp41 Mymetics label go since it isn't there any longer, looks like some product changes going on over there https://immunodx.com/ popular https://www.mybiosource.com/hiv-1-gp41-cow-human-recombinant-protein/hiv-i-transmembrane-glycoprotein-gp41/553038