Objective To study the difference of the immunogenicity of the leaflets,arterial wall and myocardium of conduit valved homograft(CVH)cryopreserved with liquid nitrogen.

• 目的进行液氮冻存人同种带瓣主、肺动脉(CVH)瓣叶、动脉壁和瓣下心肌组织的免疫原性对比研究。