Cluster 256: donors hla matched siblings unrelated donor related haploidentical allele drb Cluster 349: hla typing resolution drb donor high unrelated matched allele dqb Cluster 724: dr donor matched hla unrelated loci allele dq antigen related Cluster 1091: hla matched leukocyte donor antigen human unrelated related drb sibling Cluster 1443: donor age years matched related haploidentical sibling morbidity score yr Cluster 1883: resolution match donor typing drb hla dna high unrelated using Cluster 1911: matched donor unrelated related hla available donate mismatched allele suitable Cluster 2099: sibling donor hla matched identical offspring parent transplant available haploidentical Cluster 2332: donors donor marrow blood related meet apheresis unrelated nmdp guidelines