.alpha.-D-Deoxycytidine phosphorothioate 14-mer oligonucleotide [[S(d.alpha.C)14], duplex with Poly(rl) 5'-xC xC xC xC xC xC xC xC xC xC xC xC xC xC-3' and 3' rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI rI -5' AIDS-004813 AIDS004813 Poly(rl).S(d.alpha.C)14