AIDS-001221 AIDS001221 CD4 77-94 deriv. KIEDSDTYIC(bzl)EVEDQKEE KIEDSDTYICEVEDQKEE Lys-Ile-Glu-Asp-Ser-Asp-Thr-Tyr-Ile-Cys-Glu-Val-Glu-Asp-Gln-Lys-Glu-Glu (CD4 77-94 derivative)