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Pathological observation of rats' femur and tibia stained with TRAP. Magnification: 100×. Normal: normal rats control; Model: rats treated with retinoic acid (80 mg/kg/d); Medicine: rats treated with retinoic acid (80 mg/kg/d) and a single dose of 0.5 ml/100 g zoledronic acid; ZS40: rats treated with retinoic acid (80 mg/kg/d) and 1 ml/100 g with 1010 CFU/kg of L. fermentum ZS40
