<em>Catharanthus roseus</em> (Madagascar Periwinkle) (IMAGE) John Innes Centre Caption In previous work the research team showed that an enzyme called THAS is involved in taking a precursor molecule called strictosidine aglycone (SA) and converting it into the heteroyohimbine molecule tetrahydroalstonine. The group explored the transcriptome of the flowering plant Catharanthus roseus (Madagascar Periwinkle), a known source of tetrahydroalstonine, and found 14 candidate enzymes with very similar sequences to THAS. Credit The John Innes Centre Usage Restrictions Please credit the John Innes Centre License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.