since the elimination reactions take place under mild conditions , they may occur in vivo following oxidation at the alpha-c of l-canavanine ( ingested or formed endogenously ) or of other amino acids with a good leaving group in the gamma-position ( e.g. , s-adenosylmethionine , methionine sulfoximine , homocyst ( e ) ine , or cysteine-homocysteine mixed disulfide ) by an l-amino acid oxidase , a transaminase , or a dehydrogenase .
C0006825
canavanine
C0002520
amino acids