Figure 7From: Biscarbamate cross-linked low molecular weight Polyethylenimine polycation as an efficient intra-cellular delivery cargo for cancer therapy Toxicity of the PEI-Bu polyplex. The toxicity of main organ was measured by frozen section after systematical injection of saline, naked siRNA and polyplex formed by PEI-Bu and siRNA at N/P ratio of 115. The nucleus was stained in an aqueous solution of hematoxylin.Back to article page