uman CyP. The cDNA insert from pMON9976 was used as a probe to isolate homologous clones from the B. napus cDNA library by standard colony-hybridization procedures (41); thus, the B. napus clones (e.g., pMON8612) are in the vector pTZ18R-B (Invitrogen). Several clones ofputative CyP genes were isolated from the B. napus genomic library by screening with the B. napus cDNA clones. All of the genomic clones isolated contained similar hybridizing restriction fragments (data not shown) and one was chosen for further characterization. The 3.4-kilobase (kb) Bgl II fragment of this clone was subcloned into pBluescript KS(+) (Stratagene), forming pMON8635.