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Ergosterol, a precursor of vitamin D2, is present in the cell membrane of all fungi. It can be transformed into vitamin D2 by UV-B exposure. In this study, a basidiomycete, Pleurotus sapidus, cultivated in liquid malt extract medium was exposed to UV-B light. In addition, autoclaved, abiotic mycelium was put through UV-B exposure for the first time. The effects of different UV-B exposure times, surface...