- Sequence analysis of a 9873 bp fragment of the left arm of yeast chromosome XV that contains the ARG8 and CDC33 genes, a putative riboflavin synthase beta chain gene, and four new open reading frames. Casas, C., Aldea, M., Casamayor, A., Lafuente, M.J., Gamo, F.J., Gancedo, C., Ariño, J., Herrero, E. Yeast (1995)