Hoekstra, F.M.E.

valve allograft valve allografts antigen class cryopreserved donor antibody transplantation patient aortic study leaflet response heart thorac lymphocytes graft hla class i recipient valve donor cryopreserved valves implantation cardiovasc result hla class ii allogeneic culture presence valve leaflets transplant cryopreservation donor-specific aortic valve allografts failure chapter month effect blood homograft class ii antigens group explanted valve pieces piece staining rejection dendritic cells valve failure vasa vasorum immunogenicity worden stimulation cryopreserved valve pieces medium antigenicity section animal fibroblast replacement allogeneic valves range method valve allograft follow-up panel reactive antibodies lymphocyte valve recipients knoop c 30 min figure endothelium valve transplantation dendritic surface procedure hoekstra survival lupinetti class ii