... plants confirmed its association with L-3,4-dihy-droxyphenylalanine (L-DOPA). It is well known that velvetbean seeds contain a high con-centration of L-DOPA (6 to 9%),20,21 which plays a role ... (64.9) 1, 5, 6, 9, 12, 13, 17Velvetbean 2-yr. crop 0.00 (0.0) No emergenceVelvetbean 1-yr. crop, 1-yr. fallow23.05 (74.8) 1, 10, 12, 13, 16, 18 Fallow 3-yr. fallow30.97 (37.3) 1, 2, 6, 10, ... Agr. Biol. Chem., 55, 61 7-6 18. 20. Damodaran, M. and Ramaswamy, R. 1937. Isolation of L-3,4-dihydroxyphenylalanine fromthe seeds of Mucuna pruriens. Biochem. J., 31, 214 9-2 152.21. Rehr, S.S.,...