title: An improved radioreceptor assay for 1,25-dihydroxyvitamin D in human plasma.
mesh_terms: D000818:Animals; D001681:Biological Assay; D002117:Calcitriol / Q000097:blood* / Q000378:metabolism; D002645:Chickens; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004386:Duodenum / Q000378:metabolism; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism; D008297:Male; D011865:Radioisotope Dilution Technique; D018167:Receptors, Calcitriol; D011987:Receptors, Steroid / Q000378:metabolism; D014316:Tritium; D014808:Vitamin D Deficiency
chemical_list: D018167:Receptors, Calcitriol; D011987:Receptors, Steroid; D014316:Tritium; D002117:Calcitriol