1. A by-product in ergocalciferol biosynthesis. 2. A phosphorylated derivative of ribulose that is an intermediate in the pentose monophosphate shunt.
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lu·mis·ter·ol lü-'mis-tə-.rȯl, -.rōl n a crystalline compound stereoisomeric with ergosterol from which it is formed by ultraviolet irradiation as an intermediate product in the production of tachysterol and vitamin D2
Medical dictionary. 2011.