A. Neighbor-joining tree based on single nucleotide polymorphism of the region B sequences obtained from S. cerevisiae and Z. bailii. The labels refer to S. cerevisiae strains, followed by the chromosome on which region B was found, if available. B. Neighbor-joining tree based on single nucleotide polymorphism of the genome sequences of 44 S. cerevisiae strains. Strains are shown in color according to their technological or geographical origin: clinical isolates in gray, European wine isolates in green, bread isolates in orange, American bioethanol production isolates in purple, European soil isolates in khaki, American isolates in blue-green, Asian isolates in dark blue and African isolates in brown.