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Forty‐eight hours after irradiation, ELISA was used to investigate the secretion quantities of BDNF, NGF, CNTF and LIF. The secretion quantities of the four investigated neurotrophic factors were increased in the M1+LLLT group compared with the M1 group. A, Secretion quantity of BDNF. B, Secretion quantity of NGF. C, Secretion quantity of CNTF. D, Secretion quantity of LIF. *P < .05, **P < .01, ***P < .001 compared with the M1 group (ANOVA)
