Fig. 5. (a) ¹⁰B-NapE4 instead of NapE4 for neutron irradiation experiments. (b) A549 cell viability observed after 72 hours post-26 minute neutron irradiation exposure. P values = ****p < 0.0001; ***p < 0.001; ns: no significance. (c) The clone formation assay of irradiated A549 cells observed at the 14th day. Note: The control group was not exposed to neutron irradiation with no boron delivery agents applied.