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. Author manuscript; available in PMC: 2020 Oct 1.
Published in final edited form as: Radiother Oncol. 2019 Mar 5;139:51–55. doi: 10.1016/j.radonc.2019.02.009

Fig.3: The effect of proton dose rate on premature cell senescence.

Fig.3:

Percentage of β-gal positive normal human lung fibroblasts (IMR90) one month after exposure to 20 Gy of 4.5 MeV protons delivered at 0.05, 100 or 1000 Gy/s. *p< 0.05, **p = 0.01