2.3.1.99 H276Y 58% of wild-type activity for production of dicaffeoylquinic acids, 92% of wild-type hydroxycinnamoyltranferase activity 737028 2.3.1.99 additional information downregulation of enzyme by antisense RNA or RNA interference results in compositional changes in lignin and wall-bound hydroxycinnamic acids. No changes in the levels of acylated flavonoids are observed 676517