. . "Pichia stipitis (aka Scheffersomyces stipitis) is a species of yeast, belonging to the \"CUG Clade\" of ascomycetous yeasts. This is a group of fungi that substitute serine for leucine when the CUG codon is encountered. S. stipitis is distantly related to brewer's yeast, Saccharomyces cerevisiae, which uses the conventional codon system. Found, among other places, in the guts of passalid beetles, S."@en . . . . .