Figure 3.

Structure of lysine, leucine, and arginine biosynthetic routes in the Archaea H. hispanica and P. horikoshii. The lysine, leucine, and arginine biosynthetic routes in H. hispanica (a) and in P. horikoshii (b) (see references in the text). Genes sharing the same colour and the same level are homologs. Genes coloured in white have no homolog in the metabolic routes studied in this work.