Phenylalanine ammonia lyase (PAL), or phenylalanine deaminase (PheD), cDNA from parsley ( Petroselinum crispum ) was s利用基因重组技术 ,在大肠杆菌中克隆并表达苯丙氨酸脱氨酶 (PAL) (EC . . .) ,并应用此酶转化肉桂酸生成L 苯丙氨酸。