Fuente: WIPO "biotechnology" The invention provides DNA coding for cytochrome P450 monooxygenases of the CYP79 family catalyzing the conversion of an aliphatic or aromatic amino acid or chain-elongated methionine homologue to the corresponding oxime. Preferred embodiments of the invention are enzymes catalyzing the conversion of L-Valine and L-Isoleucine such as the cassava enzymes CYP79D1 and CYP79D2, enzymes catalyzing the conversion of tyrosine such as the Triglochin maritima enzymes CYP79E1 and CYP79E2, enzymes catalyzing the conversion of tryptophan to the corresponding oxime indole-3-acetaldoxime such as the Arabidopsis thaliana enzyme CYP79A2 and the Brassica napus enzyme CYP79B5, and enzymes catalyzing the conversion of a chain-elongated methionine homologue such as the Arabidopsis thaliana enzymes CYP79F1 and CYP79F2. Transgenic expression of said DNA or parts thereof in plants can be used to manipulate the biosynthesis of corresponding glucosinolates or cyanogenic glucosides.