Differentially expressed orthologous genes exhibiting a conserved expression profile in rainbow trout, Xenopus , mouse, and cow. A. Supervised clustering of expression profiles in the somatic layers of the ovarian follicle in rainbow trout, Xenopus, mouse, and cow species during oocyte developmental competence acquisition: developmentally incompetent or poorly competent prophase I oocytes (NC1), developmentally competent prophase I oocytes (C1), and developmentally competent metaphase II oocytes (C2). For each species, the number of differentially expressed orthologous genes is indicated. B. Gene ontology enrichment score in clusters 1 and 2 (p<0.05).