Whole blood β3Leu33 phenotyping results for donor Donor A.

Whole blood samples were phenotyped for the presence of β3Leu33 as described. Samples obtained from Donor A repeatedly gave an HPA-1a^weak phenotype. Control samples of 2 β3Pro33 homozygous (HPA-1b1b) and one each of β3Leu33Pro33 heterozygous (HPA-1a1b) and β3Leu33 homozygous (HPA-1a1a) were included in each assay.