. . . "ycationic polypeptide is about 25 to about 35 amino acids in length and about 65 to about 70% of its residues are arginine residues and 0 to 3% of its residues are lysine residues. [0066] The polycationic polypeptides to be used in formulating the complexes of the invention may be provided as naturally occurring proteins, particularly certain protamines having a high arginine to lysine ratio as di" .