- Disruption of the MRP-L23 gene encoding the mitochondrial ribosomal protein L23 is lethal for Kluyveromyces lactis but not for Saccharomyces cerevisiae. Murray, G.L., Bao, W.G., Fukuhara, H., Zuo, X.M., Clark-Walker, G.D., Chen, X.J. Curr. Genet. (2000)