
Frequency of the “AAAATT” motif occurrence for the mitochondrial ribosomal protein genes. The X-axis indicates the location of the motif (−1 denotes the first nucleotide upstream of the start codon). (Red) The pre-WGD species (▴, K. waltii; ◆, S. kluyveri; ◼, K. lactis); (blue) the post-WGD species (◆, S. cerevisiae; ◼, S. paradoxus; ▴, S. mikatae; ×, S. bayanus; and *, S. castellii), except for K. polysporus (green ●). (Black ●) Motif occurrence in random sequences that was generated according to the GC content of K. polysporus.











