Figure 1 From: Three rounds (1R/2R/3R) of genome duplications and the evolution of the glycolytic pathway in vertebrates General overview of phylogenetic relationships among gnathostomes and the proposed phylogenetic timing of genome duplication events. Grey rectangles depict the possible position of the first genome duplication (1R); the black ones show the second genome duplication (2R), and fish-specific genome duplication (FSGD or 3R).Back to article page