'Green revolution' genes encode mutant gibberellin response modulators. by Peng, J, Richards, D, Hartley, N, Murphy, G, Devos, K, Flintham, J, Beales, J, Fish, L, Worland, A, Pelica, F, Sudhakar, D, Christou, P, Snape, J, Gale, MD, Harberd, N