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Location and sequence of the C4/89.6-V3 and C4/89.6P-V3 peptides. Peptides 39 amino acids in length contained sequences from the crown and N-terminal portion of the V3 loop synthesized C-terminal to a 16-amino-acid stretch of the C4 helper determinant of gp120. The 89.6 and 89.6P peptides differed by a single arginine (R)-to-glutamic acid (E) substitution in V3 as shown.
