Cyclotide discovery in Gentianales revisited – identification and characterization of cyclic cystine-knot peptides and their phylogenetic distribution in Rubiaceae plants - Koehbach, J; Attah, A F; Berger, A; Hellinger, R; Kutchan, T M; Carpenter, E J; Rolf, M; Sonibare, M A; Moody, J O; Wong, G KS; Dessein, S; Greger, H; Gruber, C W (Proc Natl Acad Sci U S A, 2013)