Schematic for the putative biosynthetic pathways of three major classes of active compounds in I. indigotica . Terponoids, indole derivatives, and phenylpropanoid pathways are marked with background in yellow, red, and blue, respectively. Red characters indicate the non-detected genes. Dashed line in red indicate undetected pathway. Figures in panes indicate the number of unigenes corresponding to the catalytic gene in the pathway; U, unknown; N, Not annotated.