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Quantitative analysis of immunopositivity of cannabinoid receptors in each zone of articular cartilage and bone. (A) CB1 immunopositivity. (B) CB2 immunopositivity. (C) GPR55 immunopositivity. (D) GPR18 immunopositivity. (E) TRPV1 immunopositivity. (F) PPARα immunopositivity. (G) PPARγ immunopositivity. *p<0.05, **p<0.01, ***p<0.001. DZ, deep zone; MZ, middle zone; SZ, superficial zone.
