gp120 Fragment 254-274; HIV (GP120) FRAGMENT (254-274); HIV PEPTIDE GP120, 254-274; HIV ENVELOPE PROTEIN (254-274); HIV ENVELOPE PROTEIN (GP120) FRAGMENT 254-274; H-CYS-THR-HIS-GLY-ILE-ARG-PRO-VAL-VAL-SER-THR-GLN-LEU-LEU-LEU-ASN-GLY-SER-LEU-ALA-GLU-OH; GP120 (252-272); CYS-THR-HIS-GLY-ILE-ARG-PRO-VAL-VAL-SER-THR-GLN-LEU-LEU-LEU-ASN-GLY-SER-LEU-ALA-GLU; HIV ENVELOPE PROTEIN (GP120) FRAGMENT &