Amino acid sequence alignment of C. forskohlii GGPP synthase and other plant GGPP synthases. The residues boxed in black indicate the positions of at least five of the six compared sequences while the gray shading indicates similar amino acids. Dashes indicate gaps introduced for optimization of the alignment. Numbers of amino acids are indicated in the left and right margins. Asterisks show the seven domains that are highly conserved among prenyltransferases with two aspartate-rich motifs (domain II and VI). Species and accession numbers are C. forskohlii, AY515700; S. dulcis, AB034250_1; C. sublyratus, AB034249_1; C. roseus, T09966; S. alba, T10452; A. thaliana, F85434.