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Review Question - QID 210045

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QID 210045 (Type "210045" in App Search)
A 38-year-old woman presents to her surgeon 1 year after a surgery for Crohn disease involving the removal of much of her small bowel. She had no major complications during the surgery and recovered as expected. Since then, she has noticed bone pain and weakness throughout her body. She has also had several fractures since the surgery. A panel of labs relevant to bone physiology was obtained and the results are shown below:

Serum:
Phosphate: Decreased
Calcium: Decreased
Alkaline phosphatase: Increased

The factor that is most likely abnormal in this patient can also be synthesized from which of the following?