stem cell banks graft rejection graft acceptance types of grafts cytokines xenografts allografts autografts graft transplantation hybridoma technology monoclonal antibodies cancerous immune cell myeloma cell hybridomas immunodiffusion elisa immunodiagnostics immunotherapy ag-ab interaction immunological techniues antibody antigen immune responses pathogen clearance complement system ig superfamily class switching effectiveness of vaccines multiple mechanisms antibody diversity gvhd t cells mhc
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