TABLE 2.

Levels of calcium and phosphorus in rats' serum

Group	Normal	Model	Medicine	ZS40
Calcium (mmol/L)	1.26 ± 0.10 a	1.10 ± 0.15 a	1.15 ± 0.14 a	1.78 ± 0.24 b
Phosphorus (mmol/L)	1.94 ± 0.23 a	1.72 ± 0.16 a	2.23 ± 0.32 b	2.40 ± 0.30 b

Values presented are the mean ± SD (n = 10/group). Mean values with different superscript letters in the same row are significantly different (p < .05). 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 single treatment with 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.