Rapeseed (image) Technische Universitaet Muenchen Caption Brassinosteroids are growth hormones found in all plants. The steroid hormones were first isolated in rapeseed (Brassica napus) in 1979 and were subsequently named after this plant. Credit A. Heddergott / TUM Usage Restrictions Free for use for coverage on TUM with the copyright mentioned 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.