Figure 1.
The lysine biosynthesis pathway taken from KEGG release 4.1 (December 1997) at http://www.genome.ad.jp/kegg/. The enzymes are shown in boxes with the EC numbers inside. The shaded boxes represent those enzymes whose genes are identified, in this case, in E. coli. Thus, the sequence of shaded boxes corresponds to the E. coli-specific pathway of lysine biosynthesis.
