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Comparison of PERK, eIF2α, and CHOP mRNA levels in the knee joint cartilage of the study groups (n = 8). ∗P < 0.05, ∗∗P < 0.01 compared with the normal group; #P < 0.05, ##P < 0.01 compared with the model group; &P < 0.05, &&P < 0.01 compared with the needle knife group.
