- Recombinant Hansenula polymorpha as a biocatalyst: coexpression of the spinach glycolate oxidase (GO) and the S. cerevisiae catalase T (CTT1) gene. Gellissen, G., Piontek, M., Dahlems, U., Jenzelewski, V., Gavagan, J.E., DiCosimo, R., Anton, D.L., Janowicz, Z.A. Appl. Microbiol. Biotechnol. (1996)