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Steady-state responses (2000 h) to a stepwise increase in the level of calcitriol in serum. The dotted and solid curves correspond to the responses with and without the action of FGF23. The variables include the concentrations of PTH, FGF23, calcium, and phosphate in serum, the absorption levels of calcium and phosphate in intestine, and the excretion levels of calcium and phosphate in urine.
