Jane L. Ward, Graham J. Jackson, Michael H. Beale, Paul Gaskin, Peter Hedden, Lewis N. Mander, Andrew L. Phillips, Hideharu Seto, Manuel Talon, Christine L. Willis, Theresa M. Wilson and Jan A. D. Zeevaart
(20R)- and (20S)-[20-2H1]-gibberellins A15 and A44 have been used to determine the stereochemistry of the conversion to the 20-aldehyde catalysed by gibberellin 20-oxidases.