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(A) Plasma concentration of intact fibroblast growth factor 23 (iFGF23) and (B) parathyroid hormone (PTH) in rats fed 0.6% phosphorus with intact (NP) and reduced (NxNP) renal function receiving either placebo or rapamycin (Rap). aP<0.05 vs NP; *P<0.05 vs its placebo counterpart.
