| http://www.w3.org/ns/prov#value | - To provide vitamin D and sterol composition data for the USDA National Nutrient Database for Standard Reference (SR), ten types of mushrooms, including commercially produced UV-treated portabella, were sampled as part of the National Food and Nutrient Analysis Program (NFNAP) in cooperation with the Mushroom Council (San Jose, CA) and analyzed for vitamin D2, ergosterol and ergosterol metabolites,
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