Like Trichomonas ,the Giardia genome does not encode myosin(which is rarely absent from eukaryotic genomes)and encodes a bacterial arginine metabolism path-way, supporting a close relationship.

• 象毛滴虫一样，贾第虫基因组并没有编码肌球蛋白（真核生物一般都有肌球蛋白），但是编码了细菌的精氨酸的新陈代谢途径，说明它们关系紧密。