Antisera raised against the second variable region of the external envelope glycoprotein of human immunodeficiency virus type 1 cross-neutralize and show an increased neutralization index when they act together with antisera to the V3 neutralization epitope.

Abstract excerpt

Antibodies have been raised against a synthetic peptide (IRDKIQKENALFRNL) containing a neutralizing epitope within the second variable region of the human immunodeficiency virus type 1 (HIV-1) SF2 strain external envelope glycoprotein (gp120) and also against equivalent peptides of the HIV-1 LAI, RF and MN isolates. The resulting antisera cross-react with heterologous peptides but binding to heterologous...

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