Using trypan bule exclusion test,the cytotoxicity of dir ect lyticfactor(DLF)separted and purified from the venom of Naja atra on human tumor celllines was studied.

• 用台盼蓝拒染法研究来源于眼镜蛇毒的纯化直接溶解因子（DLF）对培养人肿瘤细胞株的毒性作用。