... products. In situ RNA hybridization localized theHpPKS2 transcripts in H. perforatum leaf margins, flower petals andstamens, specifically in multicellular dark glands accumulating hypericins.Based ... Pasqua G, Avato P, Monacelli B, Santamaria AR &Argentieri MP (2003) Metabolites in cell suspension cul-tures, calli, and in vitro regenerated organs of Hyperi-cum perforatum cv. Topas. Plant ... FEBSOctaketide-producing type III polyketide synthase fromHypericum perforatum is expressed in dark glandsaccumulating hypericinsKatja Karppinen1, Juho Hokkanen2,*, Sampo Mattila2, Peter Neubauer3and Anja...