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Twenty‐four hours after irradiation, RT‐qPCR was used to investigate the mRNA levels of BDNF, NGF, CNTF and LIF. The mRNA levels of the four investigated neurotrophic factors were increased in the M1+LLLT group compared with the M1 group. A, mRNA level of BDNF. B, mRNA level of NGF. C, mRNA level of CNTF. D, mRNA level of LIF. *P < .05, **P < .01, ***P < .001 compared with the M1 group
