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The C11D8 epitope, QVMTITPPQAMGPNLVLP (residues 204 to 221), which derives from the amino terminus of the FeLV-B PRR, was substituted for LKITNMPAVAVGPDLVLV (residues 213 to 230) in a corresponding region of the GALV PRR. The relative positions of VRA, VRB, and the PRR within the envelope SU protein are shown.
