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R Rühl, W Krężel, AR de Lera: 9-Cis-13,14-dihydroretinoic acid, a new endogenous mammalian ligand of retinoid X receptor and the active ligand of a potential new vitamin A category: vitamin A5. Nutrition Reviews, 2018, 76. vsk, nro 12. PubMed:30358857. doi:10.1093/nutrit/nuy057. ISSN 0029-6643. Artikkelin verkkoversio.
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R Rühl, W Krężel, AR de Lera: 9-Cis-13,14-dihydroretinoic acid, a new endogenous mammalian ligand of retinoid X receptor and the active ligand of a potential new vitamin A category: vitamin A5. Nutrition Reviews, 2018, 76. vsk, nro 12. PubMed:30358857. doi:10.1093/nutrit/nuy057. ISSN 0029-6643. Artikkelin verkkoversio.
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SN Peirson, S Halford, RG Foster: The evolution of irradiance detection: melanopsin and the non-visual opsins. Philosophical Transactions of the Royal Society B: Biological Sciences, 2009, 364. vsk, nro 1531, s. 2849–2865. PubMed:19720649. doi:10.1098/rstb.2009.0050. ISSN 0962-8436. Artikkelin verkkoversio.
R Rühl, W Krężel, AR de Lera: 9-Cis-13,14-dihydroretinoic acid, a new endogenous mammalian ligand of retinoid X receptor and the active ligand of a potential new vitamin A category: vitamin A5. Nutrition Reviews, 2018, 76. vsk, nro 12. PubMed:30358857. doi:10.1093/nutrit/nuy057. ISSN 0029-6643. Artikkelin verkkoversio.
M Davis, EV McCollum: The necessity of certain lipins in the diet during growth. Journal of Biological Chemistry, 1913, 15. vsk, nro 1, s. 167–175. ISSN 0021-9258. Artikkelin verkkoversio.
C Kennedy, EV McCollum: The dietary factors operating in the production of polyneuritis. Journal of Biological Chemistry, 1.4.1916, 493. vsk, nro 4, s. 491–502. ISSN 0021-9258. Artikkelin verkkoversio.
EV McCollum et al: Studies on experimental rickets XXI. An experimental demonstration of the existence of a vitamin which promotes calcium deposition. Journal of Biological Chemistry, 1922, 53. vsk, nro 2, s. 293–312. ISSN 0021-9258. Artikkelin verkkoversio.