Formation of a 5  hydroxy sterol by Saccharomyces cerevisiae.
D000332:Aerobiosis; D000693:Anaerobiosis; D002247:Carbon Isotopes; D004875:Ergosterol / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D013261:Sterols / Q000096:biosynthesis*; D014316:Tritium; D014807:Vitamin D / Q000096:biosynthesis*
D002247:Carbon Isotopes; D013261:Sterols; D014316:Tritium; D014807:Vitamin D; D004875:Ergosterol