HLA polymorphism identification and differentiation methodologies, HLA gene frequencies in different ethnic groups, HLA haplotype frequencies, population distribution. HLA and diseases association studies Identification of new HLA genes (alleles), compile and report rare HLA alleles. Killer Immunoglobulin-like Receptor (KIR): polymorphism, typing methodologies, KIR haplotypes, KIR HLA ligand mismatching and their impact on allogeneic hematopoietic stem cell and umbilical cord blood transplantation.