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Changes of pain-related behavior after MIA injection into the right knee joint in rats. Behavior tests were performed 1, 3, 5, 7, 10, and 14 days after injection. (a) Weight load was presented by [100 × ipsilateral weight/(ipsilateral + contralateral weight)]. (b) Paw withdrawal threshold (PWT) was measured to test mechanical allodynia. Asterisks indicate a statistically significantly difference from the control group (∗ p < 0.05).
