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(2008). https://pubmed.ncbi.nlm.nih.gov/18325990/ DOI: 10.1210/en.2007-1655","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"tissue_or_cell_type","value_text":"Duodenum","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"trigger_kind","value_text":"nutrient_deficiency","comparator":null,"unit":null,"notes":"Imported condition classification; unverified.","entity":null}],"evidence":[{"id":"425b298a-f272-5b5f-bf83-1be57cf3fbb0","evidence_kind":"source_excerpt","locator":"Lines 649-663","start_line":649,"end_line":663,"excerpt":"### vdm-calcitriol-restores-transport-after-d-deficiency\nCalcitriol administration increased active duodenal calcium transport in vitamin-D-deficient wild-type mice in the Benn study.\nCondition category: nutrient_deficiency\nnutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect.\nplain_language: Providing the active hormone restored part of the intestinal calcium-transport response after vitamin D deprivation.\norganism: Mus musculus\ntissue_or_cell_type: Duodenum\nexperimental_model: Vitamin-D-deficient wild-type mice; everted duodenal gut-sac calcium transport\nlimitations: Wild-type arm is separated from the knockout arms; this is active-hormone replacement, not a D2/D3 oral-dose equivalence test.\nexposure: Diet-induced vitamin D deficiency followed by calcitriol administration; exact replacement dose/time not reported in the retrieved abstract.\ncross_nutrient: Vitamin D–calcium–phosphate regulation.\nevidence_locator: Abstract: reported experimental results\nnutrient: Vitamin D2 and D3\nevidence_scope: D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison.\n[vdm-benn2008] Active intestinal calcium transport in the absence of transient receptor potential vanilloid type 6 and calbindin-D9k. 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