The invention relates to relates to human immunodeficiency virus (HIV) immunogens based on gp41 epitopes located in the membrane proximal extracellular region (MPER). The immunogens of the present invention are capable of inducing the expression of neutralizing antibodies. Various forms of these isolated immunogens are disclosed and exemplified. Isolated nucleic acid molecules expressing relevant portions of these immunogens, as well as the vectors and host cells utilized for their production, are also within the scope of the present invention.