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Number of core and specific genes among the seven Ostreococcus lucimarinus viruses. Pale blue circle, OlV core genes; gray circle, genes present in more than one OlV but not in all seven of the genomes; dark blue triangles, genes specific to only one OlV; yellow external circles, number of these specific genes shared between this OlV and at least one other prasinovirus. See Materials and Methods for the determination of the orthologous genes.
