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  • Title: An essential fungal growth factor derived from ergosterol: a new end product of sterol biosynthesis in fungi?
    Author: Parks LW, Rodriguez RJ, Low C.
    Journal: Lipids; 1986 Jan; 21(1):89-91. PubMed ID: 3515097.
    Abstract:
    Concentrations of ergosterol as low as 1.2 mM are effective in satisfying the essential high specificity microrequirement for C5,6 unsaturated sterol in yeast. In a sterol auxotroph supplemented with saturated sterol (cholestanol), aqueous extracts of yeast provide a growth factor that eliminates the ergosterol microrequirement. The factor is easily differentiated from ergosterol by solubility, thermostability, and thin layer and liquid chromatography and is functional at levels equivalent to those of vitamins, hormones and pheromones.
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