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Dose response of intramuscular injection of tetrodotoxin on resiniferatoxin (RTX) -induced mechanical allodynia. TTX was injected daily for 4 days, starting from the 7th day after RTX injection. Mechanical pain was detected at 1 h after TTX injection. Data are expressed as mean ± SD (n = 10). *** p < 0.001 compared with the RTX group; # p < 0.05 compared with the control group.
