Use of single-ligand formulations led to a reduction in viability (increased toxicity) not only in target KB cells but also in off-target cells with the targeted receptor available.

• 使用单配体配方不仅会导致靶向KB细胞活性的减少（增强了毒性），同时也使含有靶向受体的非靶向细胞活性降低。