{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,11]],"date-time":"2026-02-11T17:28:52Z","timestamp":1770830932544,"version":"3.50.1"},"reference-count":24,"publisher":"Springer Science and Business Media LLC","issue":"5417","license":[{"start":{"date-parts":[[1973,8,1]],"date-time":"1973-08-01T00:00:00Z","timestamp":113011200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.springer.com\/tdm"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nature"],"published-print":{"date-parts":[[1973,8]]},"DOI":"10.1038\/244515a0","type":"journal-article","created":{"date-parts":[[2005,8,2]],"date-time":"2005-08-02T11:47:09Z","timestamp":1122983229000},"page":"515-517","source":"Crossref","is-referenced-by-count":203,"title":["Natural and Synthetic Sources of Circulating 25-Hydroxyvitamin D in Man"],"prefix":"10.1038","volume":"244","author":[{"suffix":"JUN.","given":"JOHN G.","family":"HADDAD","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"THEODORE J.","family":"HAHN","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","reference":[{"key":"BF244515a0_CR1","doi-asserted-by":"publisher","first-page":"712","DOI":"10.1055\/s-0028-1137830","volume":"45","author":"K Huldschinsky","year":"1919","unstructured":"Huldschinsky, K., Dt. med. Wschr., 45, 712 (1919).","journal-title":"Dt. med. Wschr."},{"key":"BF244515a0_CR2","doi-asserted-by":"crossref","first-page":"405","DOI":"10.1016\/S0021-9258(18)85139-0","volume":"61","author":"H Steenbock","year":"1924","unstructured":"Steenbock, H., and Black, A., J. biol. Chem., 61, 405 (1924).","journal-title":"J. biol. Chem."},{"key":"BF244515a0_CR3","doi-asserted-by":"crossref","first-page":"301","DOI":"10.1016\/S0021-9258(18)85064-5","volume":"62","author":"AF Hess","year":"1924","unstructured":"Hess, A. F., and Weinstock, M., J. biol. Chem., 62, 301 (1924).","journal-title":"J. biol. Chem."},{"key":"BF244515a0_CR4","doi-asserted-by":"publisher","first-page":"501","DOI":"10.1126\/science.157.3788.501","volume":"157","author":"WF Loomis","year":"1967","unstructured":"Loomis, W. F., Science, N. Y., 157, 501 (1967).","journal-title":"Science, N. Y."},{"key":"BF244515a0_CR5","first-page":"195","volume":"38","author":"CE Dent","year":"1969","unstructured":"Dent, C. E., and Smith, R., Q. Jl Med., 38, 195 (1969).","journal-title":"Q. Jl Med."},{"key":"BF244515a0_CR6","doi-asserted-by":"publisher","first-page":"98","DOI":"10.1093\/ajcn\/14.2.98","volume":"14","author":"RW Smith","year":"1964","unstructured":"Smith, R. W., Rizek, J., and Frame, B., Am. J. clin. Nutr., 14, 98 (1964).","journal-title":"Am. J. clin. Nutr."},{"key":"BF244515a0_CR7","first-page":"831","volume":"52","author":"J Warkany","year":"1936","unstructured":"Warkany, J., Am. J. Dis. Child., 52, 831 (1936).","journal-title":"Am. J. Dis. Child."},{"key":"BF244515a0_CR8","doi-asserted-by":"publisher","first-page":"255","DOI":"10.1038\/229255a0","volume":"299","author":"R Neer","year":"1971","unstructured":"Neer, R., Davis, T., Walcott, E., and Thorington, L., Nature, 299, 255 (1971).","journal-title":"Nature"},{"key":"BF244515a0_CR9","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1152\/physrev.1935.15.1.1","volume":"15","author":"CE Bills","year":"1935","unstructured":"Bills, C. E., Physiol. Rev., 15, 1 (1935).","journal-title":"Physiol. Rev."},{"key":"BF244515a0_CR10","doi-asserted-by":"publisher","first-page":"1273","DOI":"10.1172\/JCI106093","volume":"48","author":"G Ponchon","year":"1969","unstructured":"Ponchon, G., and DeLuca, H. F., J. clin. Invest., 48, 1273 (1969).","journal-title":"J. clin. Invest."},{"key":"BF244515a0_CR11","doi-asserted-by":"publisher","first-page":"1503","DOI":"10.1073\/pnas.61.4.1503","volume":"61","author":"JW Blunt","year":"1968","unstructured":"Blunt, J. W., Tanaka, Y., and DeLuca, H. F., Proc. natn. Acad. Sci. U.S.A., 61, 1503 (1968).","journal-title":"Proc. natn. Acad. Sci. U.S.A."},{"key":"BF244515a0_CR12","doi-asserted-by":"publisher","first-page":"1049","DOI":"10.1093\/jn\/100.9.1049","volume":"100","author":"T Suda","year":"1970","unstructured":"Suda, T., DeLuca, H. F., and Tanaka, Y., J. Nutr., 100, 1049 (1970).","journal-title":"J. Nutr."},{"key":"BF244515a0_CR13","doi-asserted-by":"publisher","first-page":"764","DOI":"10.1038\/228764a0","volume":"228","author":"DR Fraser","year":"1970","unstructured":"Fraser, D. R., and Kodicek, E., Nature, 228, 764 (1970).","journal-title":"Nature"},{"key":"BF244515a0_CR14","doi-asserted-by":"publisher","first-page":"56","DOI":"10.1001\/archinte.1972.00320010060005","volume":"129","author":"M Holick","year":"1972","unstructured":"Holick, M., DeLuca, H. F., and Avioli, L. V., Arch. intern. Med., 129, 56 (1972).","journal-title":"Arch. intern. Med."},{"key":"BF244515a0_CR15","doi-asserted-by":"publisher","first-page":"992","DOI":"10.1210\/jcem-33-6-992","volume":"33","author":"JG Haddad","year":"1971","unstructured":"Haddad, J. G., and Chyu, K., J. clin. Endocr. Metab., 33, 992 (1971).","journal-title":"J. clin. Endocr. Metab."},{"key":"BF244515a0_CR16","doi-asserted-by":"publisher","first-page":"30","DOI":"10.1093\/biomet\/37.1-2.30","volume":"37","author":"KA Kermack","year":"1950","unstructured":"Kermack, K. A., and Haldane, J. B. S., Biometrika, 37, 30 (1950).","journal-title":"Biometrika"},{"key":"BF244515a0_CR17","doi-asserted-by":"publisher","first-page":"39","DOI":"10.1042\/cs0400039","volume":"40","author":"EB Mawer","year":"1971","unstructured":"Mawer, E. B., Lumb, G. A., Schaefer, K., and Stanbury, S. W., Clin. Sci., 40, 39 (1971).","journal-title":"Clin. Sci."},{"key":"BF244515a0_CR18","first-page":"22","volume":"81","author":"JG Haddad","year":"1973","unstructured":"Haddad, J. G., Chyu, K., Hahn, T. J., and Stamp, T. C. B., J. Lab. clin. Med., 81, 22 (1973).","journal-title":"J. Lab. clin. Med."},{"key":"BF244515a0_CR19","first-page":"147","volume":"99","author":"G Ponchon","year":"1969","unstructured":"Ponchon, G., and DeLuca, H. F., J. Nut., 99, 147 (1969).","journal-title":"J. Nut."},{"key":"BF244515a0_CR20","doi-asserted-by":"crossref","first-page":"460","DOI":"10.1016\/S0022-2275(20)39495-5","volume":"12","author":"MF Holick","year":"1971","unstructured":"Holick, M. F., and DeLuca, H. F., J. Lipid Res., 12, 460 (1971).","journal-title":"J. Lipid Res."},{"key":"BF244515a0_CR21","doi-asserted-by":"crossref","first-page":"739","DOI":"10.1016\/S0022-2275(20)38950-1","volume":"7","author":"J Lund","year":"1966","unstructured":"Lund, J., and DeLuca, H. F., J. Lipid Res., 7, 739 (1966).","journal-title":"J. Lipid Res."},{"key":"BF244515a0_CR22","unstructured":"Food Values of Portions Commonly Used, eleventh ed. (edit. by Church, C., and Church, H.) (J. B. Lippincott, Philadelphia, 1970)."},{"key":"BF244515a0_CR23","doi-asserted-by":"publisher","first-page":"679","DOI":"10.1172\/JCI106538","volume":"50","author":"SJ Rosenstreich","year":"1971","unstructured":"Rosenstreich, S. J., Rich, C., and Volwiler, W., J. clin. Invest., 50, 679 (1971).","journal-title":"J. clin. Invest."},{"key":"BF244515a0_CR24","doi-asserted-by":"publisher","first-page":"413","DOI":"10.1042\/cs0430413","volume":"43","author":"EB Mawer","year":"1972","unstructured":"Mawer, E. B., Backhouse, J., Holman, C. A., Lumb, G. A., and Stanbury, S. W., Clin. Sci., 43, 413 (1972).","journal-title":"Clin. Sci."}],"container-title":["Nature"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/www.nature.com\/articles\/244515a0","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/www.nature.com\/articles\/244515a0.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/www.nature.com\/articles\/244515a0.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,12,1]],"date-time":"2021-12-01T23:35:14Z","timestamp":1638401714000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.nature.com\/articles\/244515a0"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1973,8]]},"references-count":24,"journal-issue":{"issue":"5417","published-print":{"date-parts":[[1973,8]]}},"alternative-id":["BF244515a0"],"URL":"https:\/\/doi.org\/10.1038\/244515a0","relation":{},"ISSN":["0028-0836","1476-4687"],"issn-type":[{"value":"0028-0836","type":"print"},{"value":"1476-4687","type":"electronic"}],"subject":[],"published":{"date-parts":[[1973,8]]}}}