<prompt> Most impoant HLA for organ transplantation and tissue typing:-HLA-AHLA-BHLA-CHLA-D  <response>: Most impoant HLA for organ transplantation and tissue typing is HLA-D. HLA matching has a relatively small but definite beneficial effect on renal allograft survival HLA-DR HLA-B HLA- A HLA MATCHING HLA antigens Are the MC cause of graft rejectionQ Anti-HLA antibodies may cause Hyperacute rejectionQ In the case of liver transplants, HLA matching does not confer an advantageQ 