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Specificity of Chimpanzee Antibodies Binding a Strain‐Specific HIV‐1 Neutralization Epitope of the External Envelope

Sera from three chimpanzees infected with a primary lymphadenopathy‐associated virus (LAV‐1) or human T‐lymphotropic virus type III (HTLV‐IIIB) passage, from two chimpanzees infected with blood from the primary infected chimpanzees, and from one chimpanzee infected with blood from a secondary passage animal all bound the peptides 3B and 3B/RF, sharing the sequence IQRGPGR, with equally high titers. Pepscan analysis confirmed the amino acids Q, R, G, P, and G as irreplaceable in order to retain antigenicity.