- Kluyveromyces lactis SEF1 and its Saccharomyces cerevisiae homologue bypass the unknown essential function, but not the mitochondrial RNase P function, of the S. cerevisiae RPM2 gene. Groom, K.R., Heyman, H.C., Steffen, M.C., Hawkins, L., Martin, N.C. Yeast (1998)