AIDS-051961 AIDS051961 NH2-Arg-Trp-Cys(x2)-Tyr-Arg-Lys-Cys(x1)-Tyr-Lys-Gly-Tyr-Cys(x1)-Tyr-Arg-Lys-Cys(x2)-Arg-NH2 T22 ANALOGUE T52