Figure 7From: The primordial metabolism: an ancestral interconnection between leucine, arginine, and lysine biosynthesisEvolutionary model for the assembly of lysine, leucine, and arginine biosynthetic pathways. Evolutionary model proposed to explain the evolution and the assembly of lysine, leucine, and arginine biosynthetic pathways starting from the hypothetical common route. Dashed circles indicates more than one metabolic step.Back to article page