Hedysarum sulphurescens, the yellow sweetvetch or white sweetvetch, is a perennial herb species.

Leucocyanidin reductase (LCR) uses 2,3-trans-3,4-cis-leucocyanidin to produce (+)-catechin and is the first enzyme in the proanthocyanidins (PA)-specific pathway.

Its activity has been measured in leaves, flowers, and seeds of H.

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