O'Keefe, B. R. Isolation and Characterization of S-Adenosyl-L-Methionine:Tetrahydroberberine-cis-N-Methyltransferase from Suspension Cultures of Sanguinaria canadensis L. [electronic resource] - Plant physiology May 1994 - 395-403 p. digital Publication Type: Journal Article ISSN: 1532-2548 Standard No.: 10.1104/pp.105.1.395 doi