- Homologous maturase-like proteins are encoded within the group I introns in different mitochondrial genes specifying Yarrowia lipolytica cytochrome c oxidase subunit 3 and Saccharomyces cerevisiae apocytochrome b. Matsuoka, M., Matsubara, M., Kakehi, M., Imanaka, T. Curr. Genet. (1994)