Figure 2.

Phylogenetic Analysis of A. annua Triterpenoid Biosynthesis Enzymes.

A. annua OSC2, CAS, LUS, and OSC3 are highlighted in brown. Specific β-amyrin synthases are in green, lupeol synthases in blue, dammarenediol synthase in pink, and cycloartenol synthases in purple. All mixed OSCs that cyclize 2,3-oxidosqualene to multiple products are in black. The amino acid sequences were retrieved from GenBank (http://www.ncbi.nlm.nih.gov/genbank/). The scale bar represents the number of amino acid substitutions per site.